Air conditioning device and control method thereof

Abstract

The invention discloses an air conditioning device and a control method thereof. One end of a refrigerant heat exchanger is connected with a four-way valve, and the other end of the refrigerant heat exchanger is connected between an indoor heat exchanger and the four-way valve; the one-way valve is located between the refrigerant heat exchanger and the indoor heat exchanger. The switch device is positioned among the four-way valve, the indoor heat exchanger and the refrigerant heat exchanger; the control module controls the refrigerant heat exchanger to be in the position for supplying heat to the outdoor unit chassis and controls the switch device to be in the state that refrigerants flow through the refrigerant heat exchanger. Or, the refrigerant heat exchanger is controlled to be in the position for supplying heat to the outdoor heat exchanger, and the switching device is controlled to be in the state that the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in the state that the refrigerant does not flow through the refrigerant heat exchanger. The position of the refrigerant heat exchanger can be adjusted, the refrigerant heat exchanger can supply heat to the outdoor unit chassis or the outdoor heat exchanger, frosting of the outdoor heat exchanger can be prevented, the defrosting frequency of the outdoor heat exchanger is reduced, and the heating capacity is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning equipment, and in particular, relates to an air conditioning device and a control method thereof. Background Art

[0002] When the air-conditioning device is in heating operation, there is a problem of frost on the outdoor heat exchanger. Therefore, the outdoor heat exchanger needs to be defrosted. The condensed water after defrosting flows along the outdoor heat exchanger to the outdoor unit chassis. If the defrosting time is not enough or the outdoor ambient temperature is lower than the freezing temperature, the water in the outdoor unit chassis is very easy to freeze, causing the hairpin pipe close to the outdoor unit chassis to be frozen, resulting in a decrease in the outdoor heat exchange capacity and a problem of poor heating capacity.

[0003] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present invention provides an air conditioning device and a control method thereof, so as to solve the technical problem that water freezing in the chassis of the outdoor unit of the existing air conditioning device causes the outdoor heat exchange capacity to decrease, resulting in poor heating capacity.

[0005] In order to achieve the above invention / design purpose, the present invention adopts the following technical solutions: An air conditioning device, comprising: A refrigerant circulation system, comprising a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence through pipelines, wherein the indoor heat exchanger is connected to the four-way valve; An outdoor unit chassis is located below the outdoor heat exchanger. The refrigerant circulation system comprises: A refrigerant heat exchanger, wherein the refrigerant heat exchanger is in a position to supply heat to an outdoor heat exchanger or to supply heat to a chassis of an outdoor unit, one end of the refrigerant heat exchanger is connected to a four-way valve, and the other end is connected between the indoor heat exchanger and the four-way valve; a one-way valve, located between the refrigerant heat exchanger and the indoor heat exchanger; A switch device, located between the four-way valve and the indoor heat exchanger and the refrigerant heat exchanger; The outdoor unit chassis temperature detection module is used to detect the chassis temperature of the outdoor unit; An outdoor heat exchanger temperature detection module is used to detect the temperature of the outdoor heat exchanger; A control module, used for controlling the refrigerant heat exchanger to be in a position to supply heat to the outdoor unit chassis and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis set temperature; used for controlling the refrigerant heat exchanger to be in a position to supply heat to the outdoor heat exchanger and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the temperature of the outdoor heat exchanger is lower than the heat exchanger set temperature; otherwise, controlling the switch device to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

[0006] In the air-conditioning device as described above, the control module is used to control the switch device to fully open the refrigerant heat exchanger and fully close the indoor heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis setting temperature or the temperature of the outdoor heat exchanger is lower than the heat exchanger setting temperature; or, to adjust the opening of the switch device to the refrigerant heat exchanger according to the relationship between the chassis temperature of the outdoor unit and the chassis setting temperature, and the relationship between the outdoor heat exchanger temperature and the heat exchanger setting temperature; the opening of the switch device to the refrigerant heat exchanger is positively correlated with the difference between the chassis temperature of the outdoor unit and the chassis setting temperature; the opening of the switch device to the refrigerant heat exchanger is positively correlated with the difference between the outdoor heat exchanger temperature and the heat exchanger setting temperature.

[0007] The air conditioning device as described above includes an outdoor fan, and the control module is used to control the outdoor fan to rotate and blow the heat generated by the refrigerant heat exchanger to the outdoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger.

[0008] In the air-conditioning device as described above, the control device is used to control the refrigerant heat exchanger to be in a fixed position or a position range for supplying heat to the outdoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger; when the position for supplying heat to the outdoor heat exchanger is a position range, the control module is used to control the refrigerant heat exchanger to operate within the position range.

[0009] In the air-conditioning device as described above, the control module is used to control the defrosting of the outdoor heat exchanger when the outdoor heat exchanger needs to be defrosted. After the defrosting of the outdoor heat exchanger is completed, the chassis temperature of the outdoor unit is detected, and whether the chassis of the outdoor unit needs to be heated by the refrigerant heat exchanger is determined according to the chassis temperature of the outdoor unit.

[0010] The air conditioning device as described above, the air conditioning device comprises: Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; The control module is used to determine the operation time of the refrigerant heat exchanger according to the outdoor ambient temperature.

[0011] In the air-conditioning device as described above, the control module is used to control the switch device to a state in which the refrigerant does not flow through the refrigerant heat exchanger when the chassis temperature of the outdoor unit is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature after the refrigerant heat exchanger starts running; otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger is extended.

[0012] A control method for an air conditioning device, the control method comprising: Detect the chassis temperature of the outdoor unit; When the chassis temperature of the outdoor unit is lower than the chassis set temperature, the refrigerant heat exchanger is controlled to be in a position to heat the chassis of the outdoor unit, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; Detect the temperature of the outdoor heat exchanger; When the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the refrigerant heat exchanger is controlled to be in a position to supply heat to the outdoor heat exchanger, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

[0013] The control method of the air conditioning device as described above, wherein the air conditioning device comprises an outdoor fan; When the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the outdoor fan is controlled to rotate and blow the heat generated by the refrigerant heat exchanger to the outdoor heat exchanger.

[0014] The control method of the air conditioning device as described above, wherein the air conditioning device includes an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; Determine the operating time of the refrigerant heat exchanger according to the outdoor ambient temperature; After the refrigerant heat exchanger starts running, when the chassis temperature of the outdoor unit is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger is extended.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: The air-conditioning device of the present invention comprises a refrigerant circulation system, an outdoor unit chassis, an outdoor unit chassis temperature detection module, an outdoor heat exchanger temperature detection module and a control module. The refrigerant circulation system comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a refrigerant heat exchanger which are sequentially connected through pipelines. The refrigerant heat exchanger is in a position to supply heat to the outdoor heat exchanger or to supply heat to the outdoor unit chassis. One end of the refrigerant heat exchanger is connected to the four-way valve, and the other end is connected to between the indoor heat exchanger and the four-way valve. The one-way valve is located between the refrigerant heat exchanger and the indoor heat exchanger. The switch device is located between the four-way valve and the indoor heat exchanger and the refrigerant heat exchanger; the control module is used to control the refrigerant heat exchanger to be in a position to heat the outdoor unit chassis and control the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis setting temperature; it is used to control the refrigerant heat exchanger to be in a position to heat the outdoor heat exchanger and control the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the outdoor heat exchanger temperature is lower than the heat exchanger setting temperature; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger. The present invention can avoid or defrost the outdoor unit chassis by providing heat to the outdoor unit chassis through the refrigerant heat exchanger. At the same time, the position of the refrigerant heat exchanger can be adjusted. When the outdoor heat exchanger is at risk of frosting, the refrigerant heat exchanger provides heat to the outdoor heat exchanger, which can prevent the outdoor heat exchanger from frosting, reduce the number of defrosting times of the outdoor heat exchanger, and ensure the heating capacity.

[0016] The control method of the air conditioner of the present invention is as follows: detecting the temperature of the chassis of the outdoor unit; when the temperature of the chassis of the outdoor unit is lower than the set temperature of the chassis, controlling the refrigerant heat exchanger to be in a position to heat the chassis of the outdoor unit, and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, controlling the switch device to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; detecting the temperature of the outdoor heat exchanger; when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, controlling the refrigerant heat exchanger to be in a position to heat the outdoor heat exchanger, and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, controlling the switch device to be in a state where the refrigerant does not flow through the refrigerant heat exchanger. The present invention can avoid or defrost the ice of the chassis of the outdoor unit by providing heat to the chassis of the outdoor unit through the refrigerant heat exchanger. At the same time, the position of the refrigerant heat exchanger can be adjusted. When there is a risk of frost on the outdoor heat exchanger, the refrigerant heat exchanger provides heat to the outdoor heat exchanger, which can prevent the outdoor heat exchanger from frosting, reduce the number of defrosting times of the outdoor heat exchanger, and ensure the heating capacity.

[0017] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a refrigerant circulation system according to a specific embodiment of the present invention (when the refrigerant heat exchanger provides heat for the chassis of an outdoor unit).

[0020] Figure 2 It is a schematic diagram of a refrigerant circulation system according to a specific embodiment of the present invention (when the refrigerant heat exchanger provides heat for the outdoor heat exchanger).

[0021] Figure 3 It is a structural schematic diagram of a refrigerant heat exchanger, an outdoor heat exchanger and an outdoor unit chassis according to a specific embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of the connection between the refrigerant heat exchanger and the refrigerant pipeline in a specific embodiment of the present invention.

[0023] Figure 5 It is a flow chart of a specific embodiment of the present invention.

[0024] In the figure, 01, compressor; 02, four-way valve; 03, outdoor heat exchanger; 04, indoor heat exchanger; 05, first solenoid valve; 06, throttling device; 07, outdoor fan; 08, indoor fan; 09, outdoor unit chassis; 10, outdoor unit chassis temperature detection module; 11, refrigerant heat exchanger; 12, outdoor ambient temperature sensor; 13, compressor exhaust temperature detection module; 14, second solenoid valve; 15, one-way valve; 161, rotating bracket; 162, rotating motor; 163, hose; 17, outdoor heat exchanger temperature detection module. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the implementation method, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0029] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] Since the air-conditioning device has the problem of frost on the outdoor heat exchanger and ice on the outdoor unit chassis, in order to avoid ice on the outdoor unit chassis or defrost the outdoor unit chassis, and at the same time, reduce the risk of frost on the outdoor heat exchanger and reduce the number of defrosts on the outdoor heat exchanger, a refrigerant heat exchanger is added to the air-conditioning device. The position of the refrigerant heat exchanger is adjustable. It can be adjusted to the position for heating the outdoor heat exchanger or the position for heating the outdoor unit chassis according to demand. The refrigerant heat exchanger is connected to the refrigerant circulation system. On the one hand, the refrigerant heat exchanger can heat the outdoor unit chassis, which can avoid or defrost the outdoor unit chassis. On the other hand, it can heat the outdoor heat exchanger, which can prevent frost on the outdoor heat exchanger, reduce the number of defrosts on the outdoor heat exchanger, and ensure heating capacity.

[0031] The air conditioning device and the control method thereof are specifically described below in conjunction with the accompanying drawings: like Figure 1 , Figure 2 As shown, an air conditioning device includes a refrigerant circulation system and an outdoor unit chassis 09.

[0032] The refrigerant circulation system includes a compressor 01 , a four-way valve 02 , an outdoor heat exchanger 03 , a throttling device 06 and an indoor heat exchanger 04 which are sequentially connected through pipelines, and the indoor heat exchanger 04 is connected to the four-way valve 02 .

[0033] The refrigerant circulation system further includes a refrigerant heat exchanger 11, a one-way valve 15 and a switch device.

[0034] The position of the refrigerant heat exchanger 11 is adjustable. The refrigerant heat exchanger 11 can be in a position to provide heat to the outdoor heat exchanger 03 or in a position to provide heat to the outdoor unit chassis 09 .

[0035] When the refrigerant heat exchanger 11 is in a position to provide heat to the outdoor heat exchanger 03, the heat generated by the refrigerant heat exchanger 11 can provide heat to the outdoor heat exchanger 03 to avoid frosting of the outdoor heat exchanger 03 or to defrost the outdoor heat exchanger 03 in advance when frosting occurs.

[0036] When the refrigerant heat exchanger 11 is in a position to provide heat for the outdoor unit chassis 09, the heat generated by the refrigerant heat exchanger 11 can provide heat for the outdoor unit chassis 09 to prevent the outdoor unit chassis 09 from freezing or to melt the outdoor unit chassis 09 when it is frozen.

[0037] One end of the refrigerant heat exchanger 11 is connected to the four-way valve 02 , and the other end is connected between the indoor heat exchanger 04 and the four-way valve 02 .

[0038] The one-way valve 15 is located between the refrigerant heat exchanger 11 and the indoor heat exchanger 04. The one-way valve 15 can prevent the high-temperature and high-pressure refrigerant from entering the refrigerant heat exchanger 11 in the reverse direction.

[0039] The switch device is located between the four-way valve 02 and the indoor heat exchanger 04 and the refrigerant heat exchanger 11.

[0040] exist Figure 1 , Figure 2 In the example, the switch device includes a first solenoid valve 05 and a second solenoid valve 14 , the first solenoid valve 05 is located between the four-way valve 02 and the refrigerant heat exchanger 11 , and the second solenoid valve 14 is located between the four-way valve 02 and the indoor heat exchanger 04 .

[0041] When the first solenoid valve 05 is turned on, the refrigerant in the four-way valve 02 can flow to the refrigerant heat exchanger 11 , and when the second solenoid valve 14 is turned on, the refrigerant in the four-way valve 02 can flow to the indoor heat exchanger 04 .

[0042] In some embodiments, the first solenoid valve 05 and the second solenoid valve 14 are switch valves having only a switch function.

[0043] In some embodiments, the first solenoid valve 05 and the second solenoid valve 14 are valves with switching and opening adjustment functions.

[0044] In some embodiments, the switch device is a three-way valve, wherein the three-way valve may be a three-way switch valve, or the three-way valve is a valve with switch and opening adjustment functions.

[0045] Specifically, the four-way valve 02 includes an interface A, an interface B, an interface C and an interface D. The compressor 01 is connected to the port A of the four-way valve. The port B of the four-way valve is connected to the refrigerant heat exchanger 11 through the first solenoid valve 05. The refrigerant heat exchanger 11 is connected to the indoor heat exchanger 04 through the one-way valve 15. The port B of the four-way valve 02 is connected to the indoor heat exchanger 04 through the second solenoid valve 14. The indoor heat exchanger 04 is connected to the outdoor heat exchanger 03 through the throttling device 06. The outdoor heat exchanger 03 is connected to the port D of the four-way valve 02. The port C of the four-way valve 02 is connected to the compressor 01.

[0046] The outdoor heat exchanger 03 is equipped with an outdoor fan 07 , and the outdoor fan 07 is used to dissipate heat for the outdoor heat exchanger 03 .

[0047] The indoor heat exchanger 04 is equipped with an indoor fan 08 , and the indoor fan 08 is used to dissipate heat for the indoor heat exchanger 04 .

[0048] The outdoor unit chassis 09 is located below the outdoor heat exchanger 03 and can receive condensed water from the outdoor heat exchanger 03 .

[0049] exist Figure 3 , Figure 4 In the example, the refrigerant heat exchanger 11 is rotatably installed in the outdoor unit, and the refrigerant heat exchanger 11 can be rotated to the outdoor unit chassis 09 and can also be rotated to the outdoor heat exchanger 03.

[0050] The refrigerant heat exchanger 11 is mounted on the outdoor unit chassis 09 via a rotating device.

[0051] The rotating device includes a rotating bracket 161 and a rotating motor 162 . The refrigerant heat exchanger 11 is mounted on the rotating bracket 161 . The rotating motor 162 drives the rotating bracket 161 to rotate, thereby driving the refrigerant heat exchanger 11 to rotate.

[0052] The rotating motor 162 is installed on the outdoor unit chassis 09.

[0053] Of course, in order to ensure the rotation stability of the refrigerant heat exchanger 11, a rotation track can also be set on the outdoor unit chassis 09, and the rotating bracket 161 rotates along the rotation track.

[0054] The rotating device can drive the refrigerant heat exchanger 11 to rotate to a position parallel or nearly parallel to the surface (horizontal plane) where the bottom surface of the outdoor unit chassis 09 is located, which is a position for providing heat to the outdoor unit chassis. The rotating device can drive the refrigerant heat exchanger 11 to rotate to a position at a certain angle to the surface (horizontal plane) where the bottom surface of the outdoor unit chassis 09 is located, which is a position for providing heat to the outdoor heat exchanger.

[0055] The position for supplying heat to the outdoor heat exchanger is a fixed position or a range of positions.

[0056] The fixed position is a position where the refrigerant heat exchanger 11 and the bottom surface of the outdoor unit chassis 09 (horizontal plane) form a certain angle (45 degrees, 70 degrees).

[0057] The position range is a position where the refrigerant heat exchanger 11 and the bottom surface of the outdoor unit chassis 09 are located at a certain angle range (20 degrees to 75 degrees).

[0058] In order to ensure the stability and reliability of the connection between the refrigerant heat exchanger 11 and the refrigerant pipeline during the rotation process, the refrigerant heat exchanger is connected to the refrigerant pipeline through a hose 163.

[0059] The outdoor unit chassis temperature detection module 10 is located on the outdoor unit chassis 09 , and the outdoor unit chassis temperature detection module 10 is used to detect the temperature of the outdoor unit chassis.

[0060] The outdoor heat exchanger temperature detection module 17 is located on the outdoor heat exchanger 03, and the outdoor heat exchanger temperature detection module 17 is used to detect the temperature of the outdoor heat exchanger.

[0061] The control module is used to control the refrigerant heat exchanger to be in a position to heat the outdoor unit chassis and to control the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis set temperature; and is used to control the refrigerant heat exchanger to be in a position to heat the outdoor heat exchanger and to control the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the outdoor heat exchanger temperature is lower than the heat exchanger set temperature; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

[0062] Providing heat to the outdoor unit chassis through the refrigerant heat exchanger can avoid or resolve the icing of the outdoor unit chassis. At the same time, the position of the refrigerant heat exchanger can be adjusted. When the outdoor heat exchanger is at risk of frost, the refrigerant heat exchanger provides heat to the outdoor heat exchanger, which can prevent the outdoor heat exchanger from frosting, reduce the number of defrost times of the outdoor heat exchanger, and ensure heating capacity.

[0063] The control module is used to control the switch device to fully open the refrigerant heat exchanger and fully close the indoor heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis set temperature or the outdoor heat exchanger temperature is lower than the heat exchanger set temperature.

[0064] Specifically, in Figure 1In the example, the control module is used to control the refrigerant heat exchanger 11 to be in a position to heat the outdoor unit chassis 09, control the first solenoid valve 05 of the switch device to be fully open, and the second solenoid valve 14 to be fully closed when the temperature of the outdoor unit chassis is lower than the chassis set temperature, and the switch device is in a state where the refrigerant flows through the refrigerant heat exchanger 11. The refrigerant heat exchanger 11 heats to dissipate heat to the outdoor unit chassis 09, and the refrigerant flowing through the refrigerant heat exchanger 11 enters the indoor heat exchanger 04, and the indoor heat exchanger 04 is in a heating state. The problem that the indoor heat exchanger 04 cannot heat due to the reversal of the four-way valve 02 to de-ice the outdoor unit chassis 09 can be avoided. The above process is an anti-chassis icing procedure.

[0065] exist Figure 2 In the example, the control module is used to control the refrigerant heat exchanger 11 to be in a position to provide heat for the outdoor heat exchanger 03 when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, control the first solenoid valve 05 of the switch device to be fully open, and the second solenoid valve 14 to be fully closed, and the switch device is in a state where the refrigerant flows through the refrigerant heat exchanger 11. The refrigerant heat exchanger 11 heats to dissipate heat to the outdoor heat exchanger 03, and the refrigerant flowing through the refrigerant heat exchanger 11 enters the indoor heat exchanger 04, and the indoor heat exchanger 04 is in a heating state. The problem that the indoor heat exchanger 04 cannot heat due to the reversal of the four-way valve 02 to defrost the outdoor heat exchanger 03 can be avoided. The above process is a procedure to prevent the outdoor heat exchanger from frosting.

[0066] In addition to the above situation, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger 11. That is, the first solenoid valve 05 is controlled to be closed, and the second solenoid valve 14 is controlled to be opened.

[0067] In some embodiments, the opening of the switch device to the refrigerant heat exchanger 11 is adjusted according to the relationship between the chassis temperature of the outdoor unit and the chassis setting temperature; the opening of the switch device to the refrigerant heat exchanger 11 is positively correlated with the difference between the chassis temperature of the outdoor unit and the chassis setting temperature. That is, the greater the difference between the chassis temperature of the outdoor unit and the chassis setting temperature, the greater the opening of the switch device to the refrigerant heat exchanger 11. This method can further ensure the heating effect of the indoor heat exchanger 04 and reduce the impact of the deicing of the chassis 09 of the outdoor unit on the heating effect of the indoor heat exchanger 04.

[0068] In some embodiments, the opening of the switch device to the refrigerant heat exchanger 11 is adjusted according to the relationship between the outdoor heat exchanger temperature and the heat exchanger set temperature; the opening of the switch device to the refrigerant heat exchanger 11 is positively correlated with the difference between the outdoor heat exchanger temperature and the heat exchanger set temperature. That is, the greater the difference between the outdoor heat exchanger temperature and the heat exchanger set temperature, the greater the opening of the switch device to the refrigerant heat exchanger 11. This method can further ensure the heating effect of the indoor heat exchanger 04 and reduce the impact of the pre-defrosting of the outdoor heat exchanger 03 on the heating effect of the indoor heat exchanger 04.

[0069] The air conditioning device includes an outdoor fan 07 , and the control module is used to control the outdoor fan 07 to rotate and blow the heat generated by the refrigerant heat exchanger 11 to the outdoor heat exchanger 03 when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger.

[0070] In some embodiments, the control device is used to control the refrigerant heat exchanger 11 to be in a fixed position to provide heat to the outdoor heat exchanger 03 when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger.

[0071] In some embodiments, the control device is used to control the refrigerant heat exchanger 11 to be in a position range for supplying heat to the outdoor heat exchanger 03 when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, and when the position for supplying heat to the outdoor heat exchanger 03 is in the position range, the control module is used to control the refrigerant heat exchanger 11 to move within the position range. The control module can control the refrigerant heat exchanger 11 to reciprocate within the position range to improve the uniformity of the refrigerant heat exchanger 11 supplying heat to the outdoor heat exchanger 03.

[0072] The outdoor heat exchanger of the air-conditioning device in this embodiment generally does not reach the defrosting condition, but when the defrosting condition is reached in some special circumstances, the control module is used to control the outdoor heat exchanger to defrost when the outdoor heat exchanger needs to be defrosted. After the outdoor heat exchanger is defrosted, the chassis temperature of the outdoor unit is detected, and it is determined whether the chassis of the outdoor unit needs to be heated by the refrigerant heat exchanger according to the chassis temperature of the outdoor unit. That is, after the defrosting is completed, it is immediately determined whether the outdoor chassis icing condition is met, and when the outdoor chassis icing condition is met, icing treatment is immediately performed to avoid icing.

[0073] The air conditioning device comprises an outdoor environment temperature sensor 12, and the outdoor environment temperature sensor 12 is used to detect the outdoor environment temperature.

[0074] The control module is used to determine the operating time of the refrigerant heat exchanger 11 according to the outdoor ambient temperature.

[0075] The operating time of the refrigerant heat exchanger 11 is positively correlated with the outdoor ambient temperature.

[0076] The control module is used to control the switch device to be in a state where the refrigerant does not flow through the refrigerant heat exchanger 11, and the refrigerant heat exchanger 11 stops heating when the chassis temperature of the outdoor unit is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature after the refrigerant heat exchanger starts running. Otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger 11 is extended to ensure that the temperature meets the requirements.

[0077] The anti-chassis icing procedure can be performed when the air conditioner is turned on for heating. Generally, after the outdoor heat exchanger 03 is defrosted, condensed water is likely to form on the outdoor unit chassis 09. If the outdoor temperature is too low, ice will form. Therefore, it is preferred that after defrosting, the four-way valve 02 has switched back to the heating cycle to perform the anti-chassis icing procedure: after a specific heating time, the compressor exhaust temperature detection module 13 detects whether the compressor exhaust temperature Tcom is ≥ the set temperature °C, and whether the outdoor unit chassis temperature Td detected by the outdoor unit chassis temperature detection module 10 is ≤ the chassis set temperature; if so, the first solenoid valve 05 is fully opened; the second solenoid valve 14 is closed; the high-temperature and high-pressure refrigerant enters the refrigerant heat exchanger 11 through the first solenoid valve 05, heats the outdoor unit chassis 09, and then enters the indoor heat exchanger 04 through the one-way valve 15.

[0078] Under different outdoor ambient temperatures Tao, the running time T of the above chassis anti-icing program is carried out according to the following logic: When the outdoor ambient temperature Tao is in the first temperature interval, T = first time; When the outdoor ambient temperature Tao is in the second temperature range, T=second time; When the outdoor ambient temperature Tao is in the third temperature interval, T=third time; The temperature in the first temperature interval is higher than that in the second temperature interval, and the temperature in the second temperature interval is higher than that in the third temperature interval; the first time is shorter than the second time, and the second time is shorter than the third time.

[0079] After the above-mentioned operation time is completed, the chassis temperature detection module of the outdoor unit detects the chassis temperature Td of the outdoor unit and determines that Td> the chassis set temperature.

[0080] If Td>chassis set temperature, the second solenoid valve 14 is fully opened; the first solenoid valve 05 is closed; the high-temperature and high-pressure refrigerant directly enters the indoor heat exchanger 04 through the second solenoid valve 14, that is, the open valve setting of the heating state is restored.

[0081] If Td≤the set chassis temperature, it is judged that the de-icing is incomplete, and T=T+the set time, that is, the running time+the set time.

[0082] When heating operation ≥ set heating operation time: When the outdoor ambient temperature Tao ≤ the set ambient temperature ℃, and the outdoor heat exchanger temperature Tcon ≤ the heat exchanger set temperature ℃, the outdoor fan 07 reverses, and the refrigerant heat exchanger 11 rotates counterclockwise to 75° under the drive of the rotating motor 162, so that the refrigerant heat exchanger 11 is between the outdoor fan 07 and the outdoor heat exchanger 03; at this time, the reversal time of the outdoor fan 07 is T fan, at this time, the first solenoid valve 05 is forced to fully open; the second solenoid valve 14 is forced to close, that is, the refrigerant heat exchanger 11 is forced to open.

[0083] When the outdoor ambient temperature Tao is in the first temperature interval', T = first time', Tfan = first time'; When the outdoor ambient temperature Tao is in the second temperature interval', T = second time', Tfan = second time'; When the outdoor ambient temperature Tao is in the third temperature interval ', T=third time', Tfan=third time'.

[0084] Another implementation is that the refrigerant heat exchanger 11 rotates intermittently so that the hot air is blown evenly onto the outdoor heat exchanger 03; that is, the determination method is consistent with the above, but the rotation amplitude is within the position range and the operation time is consistent with the above.

[0085] Based on the design of the above air conditioning device, this embodiment also proposes a control method for the air conditioning device: Anti-chassis icing control: detect the chassis temperature of the outdoor unit; When the chassis temperature of the outdoor unit is lower than the chassis set temperature, the refrigerant heat exchanger is controlled to be in a position to heat the chassis of the outdoor unit, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; Anti-frosting procedure for outdoor heat exchanger: detect the temperature of outdoor heat exchanger; When the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the refrigerant heat exchanger is controlled to be in a position to supply heat to the outdoor heat exchanger, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

[0086] The air conditioning device comprises an outdoor fan; when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the outdoor fan is controlled to rotate and blow the heat generated by the refrigerant heat exchanger to the outdoor heat exchanger.

[0087] The air conditioning device includes an outdoor ambient temperature sensor for detecting an outdoor ambient temperature; Determine the operating time of the refrigerant heat exchanger according to the outdoor ambient temperature; After the refrigerant heat exchanger starts running, when the chassis temperature of the outdoor unit is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature, the control switch device is in a state where the refrigerant does not flow through the refrigerant heat exchanger; otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger is extended.

[0088] In some embodiments, the chassis anti-icing control or the outdoor heat exchanger anti-frost program can be entered after the machine is turned on.

[0089] Since the chassis is generally at risk of freezing only after the outdoor heat exchanger is defrosted, in some embodiments, the chassis freezing prevention control is entered after the outdoor heat exchanger is defrosted.

[0090] like Figure 5 As shown, the control method of the air conditioning device includes the following steps: S1. The outdoor heat exchanger is defrosted and the four-way valve switches to the heating state. After a specific heating time.

[0091] S2: If the compressor exhaust temperature is ≥ the set temperature and the outdoor unit chassis temperature is ≤ the chassis set temperature, then go to step S3; otherwise, run the heating normally.

[0092] S3, the first solenoid valve 05 is fully opened, the second solenoid valve 14 is closed, and the refrigerant heat exchanger is located at a position to heat the chassis of the outdoor unit. The refrigerant first flows through the refrigerant heat exchanger 11, and then enters the indoor heat exchanger 04 for heating.

[0093] S4. Determine and run the operation time of the refrigerant heat exchanger.

[0094] S5. Determine whether the chassis temperature of the outdoor unit is greater than the chassis set temperature. If so, proceed to step S6; otherwise, proceed to step S7.

[0095] S6: The first electromagnetic valve 05 is closed and the second electromagnetic valve 14 is fully opened. Then the process proceeds to step S8.

[0096] S7. The refrigerant heat exchanger 11 continues to operate for an extended period of time, and the process proceeds to step S5.

[0097] S8. Detect the outdoor heat exchanger temperature. If the outdoor heat exchanger temperature is ≤ the heat exchanger set temperature, go to step S9. Otherwise, operate normally for heating.

[0098] S9, the first electromagnetic valve 05 is fully opened, the second electromagnetic valve 14 is closed, and the refrigerant heat exchanger is located at a position to provide heat for the outdoor heat exchanger. The refrigerant first flows through the refrigerant heat exchanger 11, and then enters the indoor heat exchanger 04 for heating.

[0099] S10, determining and running the operation time of the refrigerant heat exchanger.

[0100] S11. Determine whether the outdoor heat exchanger temperature is greater than the heat exchanger set temperature. If so, proceed to step S12; otherwise, proceed to step S13.

[0101] S12, the first solenoid valve 05 is closed and the second solenoid valve 14 is fully opened.

[0102] S13, the refrigerant heat exchanger 11 continues to operate for an extended time, and the process goes to step S11.

[0103] The refrigerant heat exchanger can provide heat for the outdoor unit chassis to avoid or resolve the icing of the outdoor unit chassis. The refrigerant heat exchanger can also provide heat for the outdoor heat exchanger to prevent the outdoor heat exchanger from frosting, reduce the number of defrosting times of the outdoor heat exchanger, and ensure the heating capacity.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. An air conditioning device, comprising: A refrigerant circulation system, comprising a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence through pipelines, wherein the indoor heat exchanger is connected to the four-way valve; The outdoor unit chassis is located below the outdoor heat exchanger and is characterized in that: The refrigerant circulation system comprises: A refrigerant heat exchanger, wherein the refrigerant heat exchanger is in a position to supply heat to an outdoor heat exchanger or to supply heat to a chassis of an outdoor unit, one end of the refrigerant heat exchanger is connected to a four-way valve, and the other end is connected between the indoor heat exchanger and the four-way valve; a one-way valve, located between the refrigerant heat exchanger and the indoor heat exchanger; A switch device, located between the four-way valve and the indoor heat exchanger and the refrigerant heat exchanger; The outdoor unit chassis temperature detection module is used to detect the chassis temperature of the outdoor unit; An outdoor heat exchanger temperature detection module is used to detect the temperature of the outdoor heat exchanger; A control module, used for controlling the refrigerant heat exchanger to be in a position to supply heat to the outdoor unit chassis and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis set temperature; used for controlling the refrigerant heat exchanger to be in a position to supply heat to the outdoor heat exchanger and controlling the switch device to be in a state where the refrigerant flows through the refrigerant heat exchanger when the temperature of the outdoor heat exchanger is lower than the heat exchanger set temperature; otherwise, controlling the switch device to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

2. The air conditioning device according to claim 1, characterized in that: The control module is used to control the switch device to fully open the refrigerant heat exchanger and fully close the indoor heat exchanger when the chassis temperature of the outdoor unit is lower than the chassis setting temperature or the temperature of the outdoor heat exchanger is lower than the heat exchanger setting temperature; Alternatively, the opening degree of the switch device to the refrigerant heat exchanger is adjusted according to the relationship between the chassis temperature of the outdoor unit and the chassis set temperature, and the relationship between the outdoor heat exchanger temperature and the heat exchanger set temperature; the opening degree of the switch device to the refrigerant heat exchanger is positively correlated with the difference between the chassis temperature of the outdoor unit and the chassis set temperature; the opening degree of the switch device to the refrigerant heat exchanger is positively correlated with the difference between the outdoor heat exchanger temperature and the heat exchanger set temperature.

3. The air conditioning device according to claim 1, characterized in that: The air conditioning device includes an outdoor fan, and the control module is used to control the outdoor fan to rotate and blow the heat generated by the refrigerant heat exchanger to the outdoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger.

4. The air conditioning device according to claim 1, characterized in that: The control device is used to control the refrigerant heat exchanger to be in a fixed position or a position range for supplying heat to the outdoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger. When the position for supplying heat to the outdoor heat exchanger is a position range, the control module is used to control the refrigerant heat exchanger to operate within the position range.

5. The air conditioning device according to claim 1, characterized in that: The control module is used to control the defrosting of the outdoor heat exchanger when the outdoor heat exchanger needs to be defrosted. After the outdoor heat exchanger is defrosted, the temperature of the outdoor unit chassis is detected, and whether the outdoor unit chassis needs to be heated by the refrigerant heat exchanger is determined according to the temperature of the outdoor unit chassis.

6. The air conditioning device according to any one of claims 1 to 5, characterized in that: The air conditioning device comprises: Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; The control module is used to determine the operation time of the refrigerant heat exchanger according to the outdoor ambient temperature.

7. The air conditioning device according to claim 6, characterized in that: The control module is used to control the switch device to a state where the refrigerant does not flow through the refrigerant heat exchanger after the refrigerant heat exchanger starts running, when the outdoor unit chassis temperature is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature; otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger is extended.

8. A control method for an air conditioning device according to any one of claims 1 to 7, characterized in that: The control method is: Detect the chassis temperature of the outdoor unit; When the chassis temperature of the outdoor unit is lower than the chassis set temperature, the refrigerant heat exchanger is controlled to be in a position to heat the chassis of the outdoor unit, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; Detect the temperature of the outdoor heat exchanger; When the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the refrigerant heat exchanger is controlled to be in a position to supply heat to the outdoor heat exchanger, and the switch device is controlled to be in a state where the refrigerant flows through the refrigerant heat exchanger; otherwise, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger.

9. The control method of the air conditioning device according to claim 8, characterized in that: The air conditioning device includes an outdoor fan; When the temperature of the outdoor heat exchanger is lower than the set temperature of the heat exchanger, the outdoor fan is controlled to rotate and blow the heat generated by the refrigerant heat exchanger to the outdoor heat exchanger.

10. The control method of the air conditioning device according to claim 8, characterized in that: The air conditioning device includes an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; Determine the operating time of the refrigerant heat exchanger according to the outdoor ambient temperature; After the refrigerant heat exchanger starts running, when the chassis temperature of the outdoor unit is higher than the chassis setting temperature or the outdoor heat exchanger temperature is higher than the heat exchanger setting temperature, the switch device is controlled to be in a state where the refrigerant does not flow through the refrigerant heat exchanger; otherwise, the time for the refrigerant to flow through the refrigerant heat exchanger is extended.

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