A throttling device, control method and split air conditioner

Abstract

The application discloses a throttling device, a control method and a split air conditioner. The throttling device comprises a first interface, a first capillary, a second capillary, a pressure relief pipe and a guide mechanism. The guide mechanism has a second interface for connecting an indoor unit of the air conditioner, and the first interface is used for connecting an outdoor unit of the air conditioner. The guide mechanism is used for connecting the first capillary between the first interface and the second interface in a refrigeration throttling mode, connecting the pressure relief pipe between the first interface and the second interface in a refrigeration pressure relief energy-saving mode, connecting the first capillary and the second capillary in series and then connecting the first interface and the second interface in a heating throttling mode, and connecting the second capillary and the pressure relief pipe in series and then connecting the first interface and the second interface in a heating pressure relief energy-saving mode. The application can realize a refrigeration double-throttling mode and a heating double-throttling mode, and system flow control is no longer single, so that the purpose of variable working condition and variable flow regulation is achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a throttling device, control method, and split-type air conditioner. Background Technology

[0002] Currently, air conditioner outdoor units that use capillary throttling control have a fixed flow rate in the control system regardless of the operating conditions. However, according to the inventor's analysis and research on the actual usage of air conditioner outdoor units, the air conditioning system actually has different flow requirements under different operating conditions, but existing air conditioners cannot meet these needs and are not very effective in terms of energy saving and comfort. Summary of the Invention

[0003] In view of this, the present invention discloses a throttling device, a control method, and a split-type air conditioner to solve the problem that the capillary throttling of existing air conditioner outdoor units cannot adjust the flow rate in a timely manner.

[0004] To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0005] The first aspect of this invention discloses a throttling device for a split-type air conditioner, the split-type air conditioner including an outdoor unit and an indoor unit, the outdoor unit being provided with an outdoor heat exchanger and the indoor unit being provided with an indoor heat exchanger, the throttling device comprising:

[0006] The system comprises a first capillary tube, a second capillary tube, a pressure relief tube, a filter, and a guiding mechanism, wherein:

[0007] The filter has a first port and a second port;

[0008] The guiding mechanism has a second interface, a third interface, a fourth interface, a fifth interface, and a sixth interface, wherein:

[0009] The second capillary tube is connected between the third and fourth interfaces;

[0010] The first capillary tube is connected between the fifth interface and the first port of the filter;

[0011] The second port of the filter is connected to the outdoor heat exchanger connecting pipe of the outdoor unit of the air conditioner, and the end of the outdoor heat exchanger connecting pipe away from the second port is provided with a first interface.

[0012] The second interface is connected to the indoor heat exchanger connecting pipe, and the other end of the indoor heat exchanger connecting pipe is provided with a seventh interface;

[0013] One end of the pressure relief pipe is connected to the outdoor heat exchanger connecting pipe, and the other end is connected to the sixth interface;

[0014] The throttling device has a refrigeration throttling mode, a refrigeration pressure relief energy-saving mode, a heating throttling mode, and a heating pressure relief energy-saving mode. The guiding mechanism is used for:

[0015] In the refrigeration throttling mode, the first capillary tube is connected separately between the first interface and the second interface and connected to the indoor heat exchanger connecting pipe through a guide mechanism.

[0016] In the cooling pressure relief energy-saving mode, the pressure relief pipe is connected separately between the first interface and the second interface and connected to the indoor heat exchanger connecting pipe through a guide mechanism;

[0017] In the heating throttling mode, the first capillary tube and the second capillary tube are connected in series between the first interface and the second interface, and the indoor heat exchanger is connected to the second capillary tube through the guide mechanism, and the second capillary tube is connected to the first capillary tube.

[0018] In the heating and pressure relief energy-saving mode, the second capillary tube and the pressure relief tube are connected in series and then connected between the first interface and the second interface, and the indoor heat exchanger connecting pipe is connected to the second capillary tube through the guide mechanism.

[0019] Further optional,

[0020] The guiding mechanism includes a one-way valve. The outlet end of the one-way valve is provided with a second interface and a third interface communicating with the second interface. The third interface is connected to one end of the second capillary tube. The inlet end of the one-way valve is provided with a fourth interface, a fifth interface and a sixth interface communicating with each other.

[0021] The two ends of the second capillary are respectively connected to the third interface and the fourth interface;

[0022] One end of the first capillary is connected to the fifth interface, and the other end is connected to the first interface;

[0023] One end of the pressure relief pipe is connected to the sixth interface, and the other end is connected to the outdoor heat exchanger connecting pipe.

[0024] Alternatively, the pressure relief pipe may be equipped with a control valve for opening or closing the refrigerant passage of the pressure relief pipe.

[0025] Further optionally, the first capillary tube, the second capillary tube, and the pressure relief pipe are designed such that, within the same time period and at the same refrigerant flow rate, the pressure drop of the first capillary tube and the second capillary tube is greater than the pressure drop of the pressure relief pipe; and / or, the diameter of the pressure relief pipe is greater than the diameter of the first capillary tube and greater than the diameter of the second capillary tube.

[0026] A second aspect of this invention discloses a throttling device for a split-type air conditioner, the split-type air conditioner including an outdoor unit and an indoor unit, the outdoor unit being provided with an outdoor heat exchanger and the indoor unit being provided with an indoor heat exchanger, the throttling device comprising:

[0027] The first interface and the seventh interface are provided, wherein the first interface is used to connect to the outdoor heat exchanger of the outdoor unit of the air conditioner, and the seventh interface is used to connect to the indoor heat exchanger of the indoor unit of the air conditioner.

[0028] First capillary tube, second capillary tube, pressure relief tube, and guide mechanism;

[0029] The throttling device has a throttling mode and an energy-saving mode, and the guiding mechanism is used for:

[0030] In the throttling mode, at least one of the first capillary and the second capillary is connected between the first interface and the seventh interface.

[0031] In the energy-saving mode, the pressure relief pipe is connected between the first interface and the seventh interface;

[0032] The throttling mode includes a cooling throttling mode and / or a heating throttling mode, and the energy-saving mode includes a cooling pressure relief energy-saving mode and / or a heating pressure relief energy-saving mode.

[0033] A third aspect of the present invention discloses a control method for a throttling device, wherein the throttling device may be the throttling device of the first or second aspect of the present invention, and the control method includes:

[0034] Obtain the load of the outdoor unit of the air conditioner;

[0035] The throttling device is controlled to enter a working mode corresponding to the load of the outdoor unit of the air conditioner, wherein...

[0036] Under cooling demand, if the load of the outdoor unit of the air conditioner meets / does not meet the first set condition, the system enters the cooling pressure relief energy-saving mode / cooling throttling mode; and / or,

[0037] Under heating demand, if the load of the outdoor unit of the air conditioner meets or does not meet the second set condition, the system enters the heating pressure relief energy-saving mode or the heating throttling mode.

[0038] Alternatively, the guiding mechanism may be a one-way valve;

[0039] In the refrigeration throttling mode, the refrigerant flow direction is: outdoor unit of air conditioner, first capillary tube, one-way valve, indoor unit of air conditioner;

[0040] In the aforementioned cooling pressure relief energy-saving mode, the refrigerant flow direction is: outdoor unit of air conditioner, pressure relief pipe, one-way valve, indoor unit of air conditioner;

[0041] In the heating throttling mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube, one-way valve, first capillary tube, outdoor unit of air conditioner;

[0042] In the heating and pressure relief energy-saving mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube, one-way valve, pressure relief pipe, outdoor unit of air conditioner.

[0043] Further optional,

[0044] In both the cooling throttling mode and the heating throttling mode, the control valve in the pressure relief pipe is kept closed.

[0045] In the cooling pressure relief energy-saving mode or the heating pressure relief energy-saving mode, the control valve in the pressure relief pipe is in the open state; the control valve is used to open or close the refrigerant passage of the pressure relief pipe.

[0046] Further optional,

[0047] The process of obtaining the load of the outdoor unit of the air conditioner includes: obtaining the outdoor ambient temperature and comparing the outdoor ambient temperature with a set value, wherein the set value includes a first set value under cooling demand or a second set value under heating demand;

[0048] The step of controlling the throttling device to enter a working mode corresponding to the load of the outdoor unit of the air conditioner based on the load of the outdoor unit includes:

[0049] If the outdoor ambient temperature is less than / not less than the first preset value, it is determined that the first preset condition is met / not met, or...

[0050] If the outdoor ambient temperature is greater than or not greater than the second set value, it is determined that the second set condition is met or not met.

[0051] The fourth aspect of the present invention discloses a split-type air conditioner, which includes an outdoor unit and an indoor unit. The outdoor unit is provided with an outdoor heat exchanger, and the indoor unit is provided with an indoor heat exchanger. A throttling device provided according to any one of the first and second aspects is provided between the indoor heat exchanger and the outdoor heat exchanger; or, the split-type air conditioner adopts a control method provided according to any one of the third aspects.

[0052] Beneficial effects: This invention adds a pressure relief pipe in addition to the first and second capillary tubes of the existing throttling device, and switches the refrigerant flow direction of the throttling device under cooling and heating conditions, so as to realize the variable operating condition and variable flow design of the refrigerant path under light load and high demand. Attached Figure Description

[0053] The above and other objects, features, and advantages of the present invention will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments disclosed in the present invention; those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0054] Figure 1A A schematic diagram of a throttling device according to an embodiment of the present invention is shown as an example;

[0055] Figure 1B An example is shown Figure 1A A cross-sectional schematic diagram of the throttling device shown;

[0056] Figure 1C An example is shown Figure 1A A schematic diagram of the refrigerant flow path of the throttling device in normal refrigeration mode;

[0057] Figure 1D An example is shown Figure 1A A schematic diagram of the refrigerant flow path of the throttling device in refrigeration pressure relief throttling mode;

[0058] Figure 1E An example is shown Figure 1A A schematic diagram of the refrigerant flow path of the throttling device under normal heating conditions.

[0059] Figure 1F An example is shown Figure 1A The diagram shows the refrigerant flow path of the throttling device in heating pressure relief throttling mode.

[0060] Figure 2 A schematic flowchart of a control method for a throttling device according to an embodiment of the present invention is shown as an example;

[0061] Figure 3 A schematic flowchart of a control method for a throttling device according to an embodiment of the present invention is shown as an example.

[0062] Wherein: 1-Wire tie, 2-Filter, 3-L-shaped tube, 4-Pressure relief tube, 41-Control valve on the pressure relief tube, 5-First capillary tube, 6-Guide mechanism, 7-Connecting tube, 8-Second capillary tube, 9-I-shaped tube, A-Second interface, B-Third interface, C-Fourth interface, D-Fifth interface, E-Sixth interface, F-First interface, J-Seventh interface. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0065] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0066] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0067] To address the problem that existing capillary throttling systems in outdoor air conditioners cannot adjust flow rates in a timely manner, this embodiment discloses a throttling device using a split-type air conditioner as an example. The split-type air conditioner includes an outdoor unit and an indoor unit. The outdoor unit is equipped with an outdoor heat exchanger, and the indoor unit is equipped with an indoor heat exchanger. Combined with... Figure 1A and Figure 1BThe throttling device includes a first capillary tube 5, a second capillary tube 8, a pressure relief pipe 4, a filter 2, and a guiding mechanism 6. These will be described in detail below.

[0068] In this embodiment, filter 2 has a first port G and a second port H. It is used to filter the refrigerant to reduce the impact of impurities on the capillary.

[0069] The guide mechanism 6 has a second interface A, a third interface B, a fourth interface C, a fifth interface D, and a sixth interface E. Specifically: a second capillary tube 8 connects between the third interface B and the fourth interface C; a first capillary tube 5 connects between the fifth interface D and the first port G of the filter; the second port H of the filter 2 connects to the outdoor heat exchanger connecting pipe 9 of the air conditioner outdoor unit, and the other end of the outdoor heat exchanger connecting pipe 9 has a first interface F; the second interface A connects to the indoor heat exchanger connecting pipe 7, and the other end of the indoor heat exchanger connecting pipe 7 has a seventh interface J. One end of the pressure relief pipe 4 is connected to the outdoor heat exchanger connecting pipe 9, and the other end is connected to the sixth interface E.

[0070] In this embodiment, the throttling device is equipped with a cooling throttling mode, a cooling pressure relief energy-saving mode, a heating throttling mode, and a heating pressure relief energy-saving mode. The guide mechanism 6 is used to perform any of the following operations:

[0071] In the refrigeration throttling mode, the first capillary tube 5 is connected separately between the first interface F and the second interface A and is connected to the indoor heat exchanger connecting pipe 7 through the guide mechanism 6.

[0072] In the cooling pressure relief energy-saving mode, the pressure relief pipe 4 is connected separately between the first interface F and the second interface A and connected to the indoor heat exchanger connecting pipe 7 through the guide mechanism 6.

[0073] In the heating throttling mode, the first capillary tube 5 and the second capillary tube 8 are connected in series between the first interface F and the second interface A, and the indoor heat exchanger connecting pipe 7 is connected to the second capillary tube 8 through the guide mechanism 6, and the second capillary tube 8 is connected to the first capillary tube 5.

[0074] In the heating and pressure relief energy-saving mode, the second capillary tube 8 and the pressure relief pipe 4 are connected in series and then connected between the first interface F and the second interface A. The indoor heat exchanger connecting pipe 7 is connected to the second capillary tube 8 through the guide mechanism 6.

[0075] The throttling device provided in this embodiment adds a pressure relief pipe 4 in addition to the first capillary tube 5 and the second capillary tube 8 of the existing throttling device. The refrigerant flow direction is changed by the guide mechanism 6, so as to switch the refrigerant flow direction of the throttling device under cooling and heating conditions, and realize the variable operating condition and variable flow design of the light-load refrigerant path and the high-demand refrigerant path. For example, in cooling mode, the first capillary tube 5 is connected between the first interface F and the second interface A, and the first capillary tube 5 is used for throttling; in cooling pressure relief energy-saving mode, the pressure relief pipe 4 is connected between the first interface F and the second interface A, and the pressure relief pipe 4 is used for throttling; in heating throttling mode, the first capillary tube 5 and the second capillary tube 8 are connected in series between the first interface F and the second interface A, and the first capillary tube 5 and the second capillary tube 8 are connected in series for throttling; in heating pressure relief energy-saving mode, the second capillary tube 8 and the pressure relief pipe 4 are connected in series between the first interface F and the second interface A, and the second capillary tube 8 is used for throttling, realizing a dual throttling mode in cooling mode and a dual throttling mode in heating mode, realizing intelligent, comfortable and energy-saving control with variable operating conditions and variable flow.

[0076] Optionally, in one implementation of this embodiment, such as Figure 1B As shown, the guiding mechanism 6 includes a one-way valve. The outlet end of the one-way valve has a second port A and a third port B connected to the second port A. The third port B is connected to one end of the second capillary tube 8. The inlet end of the one-way valve has a fourth port C, a fifth port D, and a sixth port E that are interconnected. Due to the one-way conduction function of the one-way valve, the refrigerant can only flow from the inlet end (fourth port C, fifth port D, and sixth port E) along the inside of the one-way valve to the outlet end (second port A and third port B), and cannot flow from the outlet end along the inner diameter of the one-way valve to the inlet end.

[0077] The two ends of the second capillary tube 8 are connected to the third interface B and the fourth interface C, respectively;

[0078] One end of the first capillary tube 5 is connected to the fifth interface D, and the other end is connected to the first interface F;

[0079] One end of the pressure relief pipe 4 is connected to the sixth interface E, and the other end is connected to the outdoor heat exchanger connection pipe 9.

[0080] Combination Figure 1AIn this embodiment, the guiding mechanism 6 is preferably a one-way valve with five ports: second port A, third port B, fourth port C, fifth port D, and sixth port E. In cooling mode, the refrigerant flow is: outdoor unit, first capillary tube 5, one-way valve (open), and then through second port A into the indoor unit. In cooling pressure relief and energy-saving mode, the refrigerant flow is: outdoor unit, pressure relief pipe 4, one-way valve (open), and then through second port A into the indoor unit. In heating mode, the refrigerant flow is: indoor unit, through second port A into one-way valve (non-open), through third port B into second capillary tube 8, throttled and then into one-way valve, through fifth port D into first capillary tube 5, and finally the outdoor unit. In heating pressure relief and energy-saving mode, the refrigerant flow is: indoor unit, through second port A into one-way valve (non-open), through third port B into second capillary tube 8, throttled and then into one-way valve, through sixth port E into pressure relief pipe 4, and finally the outdoor unit. Due to the varying flow requirements, different throttling pipelines have different throttling ranges, which can be adjusted by changing the pipe diameter, pipeline length, and other methods to change the energy-saving range.

[0081] In one implementation of this embodiment, a control valve is provided inside the pressure relief pipe 4, located at the end of the pressure relief pipe 4 closest to the outdoor unit, for opening or closing the refrigerant passage of the pressure relief pipe 4. Specifically, when in cooling pressure relief energy-saving mode or heating pressure relief energy-saving mode, the control valve is open, allowing refrigerant to flow into the pressure relief pipe 4; when in cooling throttling mode or heating throttling mode, the control valve is closed, preventing refrigerant from flowing into the pressure relief pipe 4. In this embodiment, the throttling device, in terms of variable flow control, only requires opening or closing the control valve of the pressure relief pipe 4 to achieve switching between dual throttling modes in cooling mode and between dual throttling modes in heating mode, resulting in simple control, high reliability, and low cost. In other embodiments of the present invention, the control valve of the pressure relief pipe 4 can be understood as part of the guide mechanism 6; in other words, the guide mechanism 6 may include one-way valves and control valves located at different positions, respectively fulfilling the functions described above.

[0082] Optionally, in one implementation of this embodiment, the pressure drop of the first capillary tube 5 and the pressure drop of the second capillary tube 8 are both greater than the pressure drop of the pressure relief pipe 4; or, the diameter of the pressure relief pipe 4 is greater than the diameter of the first capillary tube 5 and the diameter of the second capillary tube 8. For example, the diameter of the pressure relief pipe 4 using ordinary pipelines is significantly larger than the diameter of the first capillary tube 5 (for example, the former's diameter is 2, 3, 4, 5 or more times that of the latter). In this way, when the pressure relief pipe 4 is open, a large amount of refrigerant will be diverted, thereby reducing the load on the compressor.

[0083] Furthermore, within the same time frame and with the same refrigerant flow rate, the pressure drop of the first capillary tube 5 is greater than or equal to that of the second capillary tube 8, and the pressure drop of the second capillary tube 8 is greater than that of the pressure relief pipe 4. With this design, in cooling mode, when the control valve is open, most of the refrigerant enters the pressure relief pipe 4, with only a small (negligible) portion entering the first capillary tube 5, thus achieving the energy-saving requirement for cooling pressure relief. In heating mode, when the control valve is open, most of the refrigerant, after being throttled by the second capillary tube, enters the pressure relief pipe 4, with only a small (negligible) portion entering the first capillary tube 5, thus achieving the energy-saving requirement for heating pressure relief.

[0084] Optionally, in one implementation of this embodiment, the guide mechanism 6 can also be a two-position four-way solenoid valve, with two working positions being a cooling working position and a heating working position. In short, the two-position four-way solenoid valve has an interface one connected to the first capillary tube 5, an interface two connected to one end of the second capillary tube 8, an interface three connected to the other end of the second capillary tube 8, and an interface four connected to the connecting pipe 7 and the pressure relief pipe 4. When the valve core moves to the cooling working position, interface one and interface four are connected, while interfaces two and three are both in a closed state; when the valve core moves to the heating working position, interface one and interface two are connected, while interfaces three and interface four are connected.

[0085] An embodiment of the present invention also provides a throttling device for a split-type air conditioner. The throttling device includes a first interface F and a seventh interface J. The first interface F is used to connect to the outdoor heat exchanger of the outdoor unit of the air conditioner, and the seventh interface J is used to connect to the indoor heat exchanger of the indoor unit of the air conditioner. The throttling device further includes a first capillary tube 5, a second capillary tube 8, a pressure relief pipe 4, and a guiding mechanism 6. The throttling device has a throttling mode and an energy-saving mode. The guiding mechanism 6 is used to: in the throttling mode, connect at least one of the first capillary tube 5 and the second capillary tube 8 between the first interface F and the seventh interface J; and in the energy-saving mode, connect the pressure relief pipe 4 between the first interface F and the seventh interface J.

[0086] The throttling modes can include the cooling throttling mode and heating throttling mode mentioned above, while the energy-saving modes can include the cooling pressure relief energy-saving mode and heating pressure relief energy-saving mode mentioned above. For a detailed explanation of the specific function of the guide mechanism 6 and the relevant characteristics of the different modes, please refer to the preceding text. Figure 1A The corresponding descriptions in the illustrated embodiments will not be repeated here.

[0087] An embodiment of the present invention also discloses a control method for the throttling device provided in any of the first aspects, wherein the throttling device is provided with a cooling throttling mode, a cooling pressure relief energy-saving mode, a heating throttling mode, and a heating pressure relief energy-saving mode, such as... Figure 2 As shown, the control method includes S1 to S2, wherein:

[0088] S1, Obtain the load of the outdoor unit of the air conditioner. Here, the load can be the real-time load during the actual operation of the outdoor unit, or it can be the predicted load before operation.

[0089] S2: The system switches to the operating mode corresponding to the load of the outdoor unit. Specifically:

[0090] Under cooling demand, and depending on whether the outdoor unit load meets or does not meet the first set condition, the system enters cooling pressure relief energy-saving mode / cooling throttling mode; and / or,

[0091] Under heating demand, and depending on whether the load of the outdoor unit meets or does not meet the second set condition, the system enters the heating pressure relief energy-saving mode or the heating throttling mode.

[0092] Using the method provided in this embodiment, the air conditioner can adaptively enter normal throttling mode or energy-saving mode according to the load of the outdoor unit, thereby realizing the variable flow design of the refrigerant path for light load demand and the refrigerant path for high load demand, making the air conditioner more energy-efficient and more comfortable.

[0093] Optionally, in one implementation scenario of this embodiment, the air conditioner can automatically execute S1 and S2 to determine whether to enter the heating pressure relief energy-saving mode after it is started. In another implementation scenario of this embodiment, the air conditioner can execute S1 and S2 after a period of time, for example, determining whether to enter the heating pressure relief energy-saving mode in heating throttling mode; and determining whether to enter the cooling pressure relief energy-saving mode in cooling throttling mode. In one implementation of this embodiment, in cooling throttling mode, the refrigerant flow direction is:

[0094] In refrigeration throttling mode, the refrigerant flow direction is: outdoor unit, first capillary tube, one-way valve, indoor unit;

[0095] In the cooling pressure relief energy-saving mode, the refrigerant flow direction is: outdoor unit of air conditioner, pressure relief pipe 4, one-way valve, indoor unit of air conditioner;

[0096] In heating throttling mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube 8, one-way valve, first capillary tube 5, outdoor unit of air conditioner;

[0097] In the heating and pressure relief energy-saving mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube 8, one-way valve, pressure relief pipe 4, outdoor unit of air conditioner.

[0098] Combination Figure 1A and Figure 1B In one embodiment of the present invention, the throttling device includes a wire tie 1, a filter 2, an L-shaped tube 3, a capillary tube 7, and an I-shaped tube 9; wherein, the wire tie 1 is a high-temperature wire tie with a length of approximately 120 mm; the filter 2 is a fork-shaped filter. The L-shaped tube 3 is used for adding refrigerant and is closed and non-conductive under normal operating conditions of the throttling device.

[0099] like Figure 1C As shown, in normal refrigeration throttling mode, the refrigerant flow direction is: 9-2-5-6-7;

[0100] like Figure 1D As shown, in the cooling pressure relief energy-saving mode, the refrigerant flow direction is: 9-4-6-7;

[0101] like Figure 1E As shown, in normal heating throttling mode, the refrigerant flow direction is: 7-6-8-6-5-2-9;

[0102] like Figure 1F As shown, in the heating pressure relief energy-saving mode, the refrigerant flow direction is: 7-6-8-6-4-9.

[0103] Furthermore, in both cooling and heating throttling modes, the control valve in the pressure relief pipe 4 is closed; this prevents the refrigerant from entering the pressure relief pipe 4. In the normal cooling mode, throttling is performed using the first capillary tube, and in the normal heating mode, throttling is performed using both the first and second capillary tubes together.

[0104] When determining whether to enter the cooling pressure relief energy-saving mode or the heating pressure relief energy-saving mode, the control valve in the pressure relief pipe 4 is opened; in this way, the refrigerant can enter the pressure relief pipe 4. In the heating pressure relief energy-saving mode, the second capillary tube 8 and the pressure relief pipe 4 are used together for throttling. In the cooling pressure relief energy-saving mode, the pressure relief pipe 4 is used for throttling, thereby realizing intelligent comfort and energy-saving control with variable operating conditions and variable flow.

[0105] Optionally, in one implementation of this embodiment, S1 obtaining the load of the outdoor unit of the air conditioner specifically includes: obtaining the outdoor ambient temperature and comparing the outdoor ambient temperature with a set value, wherein the set value includes a first set value under cooling demand or a second set value under heating demand.

[0106] S2 controls the throttling device to enter the working mode corresponding to the load of the outdoor unit of the air conditioner. Specifically, it includes: when the outdoor ambient temperature is less than / not less than the first set value, it is determined that the first set condition is met / not met; or, when the outdoor ambient temperature is greater than / not greater than the second set value, it is determined that the second set condition is met / not met.

[0107] In this implementation, for light cooling load conditions, a first set value T1 (e.g., 35-40℃) is determined based on the heat exchange capacity of the air conditioner. If the actual outdoor ambient temperature is not lower than T1, the air conditioner operates in normal cooling throttling mode. If the actual outdoor ambient temperature is lower than T1, the air conditioner operates in cooling pressure relief energy-saving mode.

[0108] For light heating load conditions, a second set value T2 (e.g., 0-7℃) is determined based on the heat exchange capacity of the air conditioner. If the actual outdoor ambient temperature is greater than T2, the air conditioner will operate in the heating pressure relief energy-saving mode. If the actual outdoor ambient temperature is not greater than T2, the air conditioner will operate in the normal heating throttling mode.

[0109] Optionally, in one implementation of this embodiment, combined with Figure 3 The control method of this embodiment will be described in detail.

[0110] like Figure 3 As shown, when the air conditioner starts up, it determines whether it is in cooling mode. If it is in cooling mode, it checks whether the outer ring temperature T meets the requirement of T≥T1. If it does, it keeps the control valve in the pressure relief pipe 4 closed and operates in cooling throttling mode. If the outer ring temperature T does not meet the requirement of T≥T1, it keeps the control valve in the pressure relief pipe 4 open and operates in cooling pressure relief energy-saving mode. If the cooling mode is not activated, it determines whether it is in heating mode. If it is, it checks whether the outer ring temperature T meets the requirement of T≥T2. If it does, it keeps the control valve in the pressure relief pipe 4 open and operates in heating pressure relief energy-saving mode. If the outer ring temperature T does not meet the requirement of T≥T1, it keeps the control valve in the pressure relief pipe 4 closed and operates in heating throttling mode. If the air conditioner is not in heating mode, it can operate normally.

[0111] In this embodiment, the throttling device has four operating modes:

[0112] (1) Cooling throttling mode

[0113] At this time, the pressure relief pipe shut-off valve is closed, and no refrigerant flows, which is equivalent to the conventional air conditioning cooling flow direction: 9-2-5-6-7.

[0114] (2) Cooling pressure relief energy-saving mode

[0115] At this point, the shut-off valve of the distributor assembly (pressure relief pipe) opens, allowing refrigerant to flow. The refrigerant does not pass through the small-diameter capillary tube for throttling and pressure reduction (this module experiences a significant pressure drop, requiring the compressor to work to increase the pressure, resulting in high power consumption). Instead, it achieves pressure reduction through the pressure drop of the ordinary piping itself (this module experiences a smaller pressure drop, requiring the compressor to work to increase the pressure, resulting in lower power consumption). This is suitable for light-load conditions such as autumn, where users still require cooling in the air-conditioned area, thus achieving energy savings. The refrigerant flow direction is: 9-4-6-7.

[0116] (3) Heating throttling mode

[0117] At this time, the pressure relief pipe shut-off valve is closed, and no refrigerant flows. This is equivalent to the flow direction of conventional air conditioning heating. The air conditioning system itself needs to go through the first capillary tube and the auxiliary capillary tube for throttling and pressure reduction to increase the compressor's exhaust to obtain a higher output capacity. The refrigerant flow direction is: 7-6-8-6-5-2-9.

[0118] (4) Heating pressure relief energy-saving mode

[0119] At this point, the pressure relief valve opens, allowing refrigerant to flow. The refrigerant no longer undergoes pressure reduction through the small-diameter first capillary tube; instead, it achieves pressure reduction via the auxiliary capillary tube and distributor assembly. This provides a second flow direction for heating, suitable for light load conditions. The refrigerant flow direction is: 7-6-8-6-4-9.

[0120] The throttling device in this embodiment realizes four throttling paths: dual throttling mode for cooling and dual throttling mode for heating. When cooling, it can operate in the conventional refrigerant flow direction throttling mode, or it can operate in energy-saving mode by depressurizing through the diverter assembly. When heating, it can operate in the conventional refrigerant flow direction throttling mode, or it can operate in the second flow direction mode through the diverter assembly. The system flow control is no longer singular, and the air conditioner can achieve the purpose of variable operating conditions and variable flow adjustment, giving full play to the characteristics of energy saving, comfort and intelligence.

[0121] One embodiment of the present invention also provides a split-type air conditioner, which includes an outdoor unit and an indoor unit. The outdoor unit is provided with an outdoor heat exchanger, and the indoor unit is provided with an indoor heat exchanger. The indoor heat exchanger and the outdoor heat exchanger are connected by a throttling device provided in the foregoing embodiments or implementations of the present invention, or the split-type air conditioner uses a control method provided in the foregoing embodiments or implementations of the present invention for throttling.

[0122] In the different embodiments provided by this invention, the same parameters, terms, logic, etc. should be understood to have the same meaning, and this application does not intentionally repeat the description in each embodiment.

[0123] Exemplary embodiments of the present disclosure have been specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, the present disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A throttling device for a split-type air conditioner, the split-type air conditioner comprising an outdoor unit and an indoor unit, the outdoor unit being provided with an outdoor heat exchanger and the indoor unit being provided with an indoor heat exchanger, characterized in that, The throttling device includes: The system comprises a first capillary tube (5), a second capillary tube (8), a pressure relief tube (4), a filter, and a guide mechanism (6), wherein: The filter has a first port (G) and a second port (H); The guiding mechanism (6) has a second interface (A), a third interface (B), a fourth interface (C), a fifth interface (D), and a sixth interface (E), wherein: The second capillary (8) is connected between the third interface (B) and the fourth interface (C); The first capillary (5) is connected between the fifth interface (D) and the first port (G) of the filter; The second port (H) of the filter is connected to the outdoor heat exchanger connecting pipe (9) of the outdoor unit of the air conditioner, and the end of the outdoor heat exchanger connecting pipe (9) away from the second port (H) is provided with a first interface (F). The second interface (A) is connected to the indoor heat exchanger connecting pipe (7), and the other end of the indoor heat exchanger connecting pipe (7) is provided with a seventh interface (J); One end of the pressure relief pipe (4) is connected to the outdoor heat exchanger connecting pipe (9), and the other end is connected to the sixth interface (E); The throttling device has a refrigeration throttling mode, a refrigeration pressure relief energy-saving mode, a heating throttling mode, and a heating pressure relief energy-saving mode. The guide mechanism (6) is used for: In the refrigeration throttling mode, the first capillary tube (5) is connected separately between the first interface (F) and the second interface (A) and connected to the indoor heat exchanger connecting pipe (7) through the guide mechanism (6); In the refrigeration pressure relief energy-saving mode, the pressure relief pipe (4) is connected separately between the first interface (F) and the second interface (A) and connected to the indoor heat exchanger connecting pipe (7) through the guide mechanism (6); In the heating throttling mode, the first capillary tube (5) and the second capillary tube (8) are connected in series between the first interface (F) and the second interface (A), and the indoor heat exchanger connecting pipe (7) is connected to the second capillary tube (8) through the guide mechanism (6), and the second capillary tube (8) is connected to the first capillary tube (5). In the heating and pressure relief energy-saving mode, the second capillary tube (8) and the pressure relief tube (4) are connected in series and then connected between the first interface (F) and the second interface (A), and the indoor heat exchanger connecting pipe (7) is connected to the second capillary tube (8) through the guide mechanism (6).

2. The throttling device as described in claim 1, characterized in that, The guide mechanism (6) is a one-way valve. The outlet end of the one-way valve is provided with a second interface (A) and a third interface (B) connected to the second interface (A). The third interface (B) is connected to one end of the second capillary (8). The inlet end of the one-way valve is provided with a fourth interface (C), a fifth interface (D) and a sixth interface (E) that are connected to each other. The two ends of the second capillary (8) are respectively connected to the third interface (B) and the fourth interface (C); One end of the first capillary (5) is connected to the fifth interface (D), and the other end is connected to the first interface (F); One end of the pressure relief pipe (4) is connected to the sixth interface (E), and the other end is connected to the outdoor heat exchanger connecting pipe (9).

3. The throttling device as described in claim 2, characterized in that, The pressure relief pipe (4) is equipped with a control valve for opening or closing the refrigerant passage of the pressure relief pipe (4).

4. The throttling device as described in claim 1 or 2, characterized in that, The first capillary tube (5), the second capillary tube (8), and the pressure relief tube (4) are designed such that, within the same time frame and at the same refrigerant flow rate, the pressure drop of the first capillary tube (5) and the second capillary tube (8) is greater than the pressure drop of the pressure relief tube (4); and / or, The diameter of the pressure relief pipe (4) is greater than the diameter of the first capillary (5) and greater than the diameter of the second capillary (8).

5. A split-type air conditioner, characterized in that: The split-type air conditioner includes an outdoor unit and an indoor unit. The outdoor unit is equipped with an outdoor heat exchanger, and the indoor unit is equipped with an indoor heat exchanger. The characteristic feature is that a throttling device as described in any one of claims 1-4 is provided between the indoor heat exchanger and the outdoor heat exchanger.

6. A control method for the split-type air conditioner according to claim 5, characterized in that, The control method includes: Obtain the load of the outdoor unit of the air conditioner; The throttling device is controlled to enter a working mode corresponding to the load of the outdoor unit of the air conditioner, wherein... Under cooling demand, if the load of the outdoor unit of the air conditioner meets / does not meet the first set condition, the system enters the cooling pressure relief energy-saving mode / cooling throttling mode; and / or, Under heating demand, if the load of the outdoor unit of the air conditioner meets or does not meet the second set condition, the system enters the heating pressure relief energy-saving mode or the heating throttling mode.

7. The control method as described in claim 6, characterized in that, The guide mechanism (6) is a one-way valve; In the refrigeration throttling mode, the refrigerant flow direction is: outdoor unit of air conditioner, first capillary tube (5), one-way valve, indoor unit of air conditioner; In the aforementioned refrigeration pressure relief energy-saving mode, the refrigerant flow direction is: outdoor unit of air conditioner, the pressure relief pipe (4), the one-way valve, and indoor unit of air conditioner; In the heating throttling mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube (8), one-way valve, first capillary tube (5), outdoor unit of air conditioner; In the heating and pressure relief energy-saving mode, the refrigerant flow direction is: indoor unit of air conditioner, one-way valve, second capillary tube (8), one-way valve, pressure relief pipe (4), outdoor unit of air conditioner.

8. The control method as described in claim 6, characterized in that, In the cooling throttling mode and the heating throttling mode, the control valve in the pressure relief pipe (4) is kept closed; In the cooling pressure relief energy-saving mode or the heating pressure relief energy-saving mode, the control valve in the pressure relief pipe (4) is in the open state; the control valve is used to open or close the refrigerant passage of the pressure relief pipe (4).

9. The control method as described in claim 6, characterized in that, The process of obtaining the load of the outdoor unit of the air conditioner includes: obtaining the outdoor ambient temperature and comparing the outdoor ambient temperature with a set value, wherein the set value includes a first set value under cooling demand or a second set value under heating demand; The step of controlling the throttling device to enter a working mode corresponding to the load of the outdoor unit of the air conditioner based on the load of the outdoor unit includes: If the outdoor ambient temperature is less than / not less than the first preset value, it is determined that the first preset condition is met / not met, or... If the outdoor ambient temperature is greater than or not greater than the second set value, it is determined that the second set condition is met or not met.

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