Air conditioning unit and control method thereof

Abstract

The invention provides an air conditioning unit and a control method thereof.The air conditioning unit comprises an outdoor unit and an indoor unit, the outdoor unit and the indoor unit are connected through a connecting pipe, the connecting pipe is provided with a temperature sensor and an on-off component, the on-off component can control the connecting pipe to be connected or disconnected, and when the connecting pipe is connected, a refrigerant can normally pass through the connecting pipe; when the connecting pipe is disconnected, the refrigerant cannot normally pass through the connecting pipe, t is set as a continuous time period, the temperature detected by the temperature sensor at the beginning of the time t is T1, the temperature detected by the temperature sensor at the end of the time t is T2, and if T1-T2 detected within the continuous time t is larger than T and T2 is smaller than T ring + T coefficient, it is judged that refrigerant leakage exists at the position of the connecting pipe; t is the preset temperature difference, T ring is the outdoor environment temperature, and T coefficient is the temperature coefficient. According to the method and the device, whether the refrigerant leaks or not can be accurately and accurately judged, and the accuracy of preventing the refrigerant from leaking is improved.

Description

Technical Field

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

[0002] Air conditioning units are often connected with copper pipes. The connecting pipes are prone to refrigerant leakage due to refrigerant pulsation and long-term operation corrosion. The commonly used refrigerant leakage detection method is to install a refrigerant leakage sensor inside the unit to monitor the refrigerant concentration. There is usually no refrigerant leakage detection device outside the shell. The commonly used pipeline refrigerant detection method, such as the soap water detection method, has a certain delay and cannot detect refrigerant leakage in time and respond.

[0003] Since the air-conditioning unit in the prior art has technical problems such as refrigerant leakage in the connecting pipe outside the shell, the present invention studies and designs an air-conditioning unit and a control method thereof. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of refrigerant leakage in the external connecting pipe of the shell of the air-conditioning unit in the prior art, thereby providing an air-conditioning unit and a control method thereof.

[0005] In order to solve the above problems, the present invention provides an air conditioning unit, comprising:

[0006] An outdoor unit and an indoor unit, the outdoor unit and the indoor unit are connected through a connecting pipe, the connecting pipe is provided with a temperature sensor and a switching component, the temperature sensor can detect the refrigerant temperature in the connecting pipe, the switching component can control the connecting pipe to be connected or disconnected, when connected, the refrigerant can pass normally in the connecting pipe, when disconnected, the refrigerant cannot pass normally in the connecting pipe, assuming t is a continuous time period, the temperature detected by the temperature sensor at the beginning of time t is T1, the temperature detected at the end of time t is T2, and if T1-T2 is greater than △T and T2 is less than T in the continuous t period, 环 +T 系数 When the temperature difference is ΔT, it is determined that there is refrigerant leakage at the connecting pipe, and the on-off component is controlled to disconnect the connecting pipe, wherein ΔT is a preset temperature difference, T 环 is the outdoor ambient temperature, T 系数 is the temperature coefficient.

[0007] In some embodiments,

[0008] The connecting pipe includes a first connecting pipe and a second connecting pipe, the outdoor unit includes a compressor, an outdoor heat exchanger and a first throttling device, the indoor unit includes an indoor heat exchanger and a second throttling device, the first connecting pipe is connected between the first throttling device and the second throttling device, the second connecting pipe is connected between the compressor and the indoor heat exchanger, and the outdoor heat exchanger can be connected to the indoor heat exchanger through the first throttling device, the first connecting pipe and the second throttling device in sequence; the temperature sensor is arranged on the first connecting pipe and / or the second connecting pipe, and the on-off component is arranged on both the first connecting pipe and the second connecting pipe.

[0009] In some embodiments,

[0010] When the air conditioning unit is in standby mode and a temperature sensor is provided on the first connecting pipe, T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe;

[0011] When the air conditioning unit is in standby mode and a temperature sensor is provided on the second connecting pipe, T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant and prevent the refrigerant from continuing to leak from the first connecting pipe.

[0012] In some embodiments,

[0013] When the air conditioning unit is in cooling operation and a temperature sensor is provided on the first connecting pipe, T 系数 =10℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 +10°C, i.e., it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe;

[0014] When the air conditioning unit is in cooling operation and a temperature sensor is provided on the second connecting pipe, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环-10℃, that is, it is judged that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant to prevent the refrigerant from continuing to leak from the second connecting pipe.

[0015] In some embodiments,

[0016] When the air conditioner is in heating operation and a temperature sensor is provided on the first connecting pipe, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10°C, i.e., it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe;

[0017] When the air conditioner is in heating operation and a temperature sensor is provided on the second connecting pipe, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10℃, that is, it is judged that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant to prevent the refrigerant from continuing to leak from the second connecting pipe.

[0018] In some embodiments,

[0019] When the air-conditioning unit is cooling, the second throttling device throttles, and the first throttling device does not throttle; when the air-conditioning unit is heating, the first throttling device throttles, and the second throttling device does not throttle.

[0020] In some embodiments,

[0021] The range of △t is 0 to 5 seconds, △T is 5 to 10℃, T 环 The range is 20±5℃.

[0022] In some embodiments,

[0023] A plurality of the temperature sensors can be arranged on the first connecting tube at intervals along the circumferential direction; a plurality of the temperature sensors can be arranged on the second connecting tube at intervals along the circumferential direction; the first connecting tube and the second connecting tube are both provided with the on-off components, which are conductive when power is lost and the refrigerant can flow normally, and are cut off when power is supplied and the refrigerant cannot flow normally.

[0024] The present invention also provides a control method for the air conditioning unit as described above, comprising:

[0025] The detection step includes detecting the refrigerant temperature in the connecting pipe as T1 at the beginning of time t, detecting the refrigerant temperature in the connecting pipe as T2 at the end of time t, and detecting the outdoor environment temperature T 环 ;

[0026] Control step: if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous period of t 环 +T 系数 When the refrigerant leaks at the connecting pipe, it is determined that there is a refrigerant leak at the connecting pipe, and the on-off component is controlled to disconnect the connecting pipe.

[0027] In some embodiments,

[0028] When the connecting pipe includes a first connecting pipe and a second connecting pipe:

[0029] When the air conditioning unit is in standby mode and a temperature sensor is provided on the first connecting pipe, the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 , it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant;

[0030] When the air conditioning unit is in standby mode and a temperature sensor is provided on the second connecting pipe, the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 , that is, it is determined that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant.

[0031] In some embodiments,

[0032] When the connecting pipe includes a first connecting pipe and a second connecting pipe:

[0033] When the air conditioning unit is in cooling operation and a temperature sensor is provided on the first connecting pipe, the control step, T 系数 =10℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 +10°C, it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant;

[0034] When the air conditioning unit is in cooling operation and a temperature sensor is provided on the second connecting pipe, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环If the temperature is -10℃, it is determined that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant.

[0035] In some embodiments,

[0036] When the connecting pipe includes a first connecting pipe and a second connecting pipe:

[0037] When the air conditioning unit is in heating operation and a temperature sensor is provided on the first connecting pipe, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 -10°C, it is determined that there is refrigerant leakage at the first connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant;

[0038] When the air conditioning unit is in heating operation and a temperature sensor is provided on the second connecting pipe, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 -10℃, that is, it is determined that there is refrigerant leakage at the second connecting pipe, and the on-off components on the first connecting pipe and the second connecting pipe are controlled to be disconnected to cut off the refrigerant.

[0039] In some embodiments,

[0040] The control step controls the second throttling device to throttle when the air-conditioning unit is cooling, and the first throttling device not to throttle; the first throttling device to throttle when the air-conditioning unit is heating, and the second throttling device not to throttle;

[0041] In the control step, after the on-off components on the first connecting pipe and the second connecting pipe are disconnected, the fan of the indoor heat exchanger is controlled to be turned on and run at the maximum speed.

[0042] The present invention provides an air conditioning unit and a control method thereof, which have the following beneficial effects:

[0043] 1. The present invention connects the outdoor unit and the indoor unit of the air conditioner unit through a connecting pipe, and a temperature sensor and a switching component are arranged on the connecting pipe, so as to detect the refrigerant temperature in the connecting pipe, and judge whether there is a refrigerant leakage at the location according to the relationship between the refrigerant temperature in the connecting pipe and the outdoor ambient temperature, especially when T1-T2 is greater than △T and T2 is less than T in a continuous period of t. 环 +T 系数When it is determined that there is a refrigerant leakage at the connecting pipe, it can accurately and precisely determine whether there is a refrigerant leakage, and when it is determined that there is a leakage, the on-off component is controlled to disconnect the connecting pipe, thereby effectively preventing the refrigerant leakage from occurring and improving the accuracy of preventing the refrigerant leakage.

[0044] 2. The present invention further does not distinguish between the two connecting pipes during standby. When a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than ΔT and T2 is less than T within a continuous Δt period, 环 , that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions are not distinguished and the temperature is not detected when in standby mode. It is more accurately determined which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0045] 3. The present invention further distinguishes the two connecting pipes during cooling operation. Since the indoor throttling device is turned on and the outdoor throttling device is turned off during cooling, the temperature at the first connecting pipe is greater than the temperature at the second connecting pipe. The temperature at the first connecting pipe is slightly higher than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 +10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 -10℃ (the temperature at the second connecting pipe is slightly lower than the ambient temperature during normal refrigeration operation), it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions during refrigeration operation are distinguished and the temperatures are detected, so that it is more accurately determined which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0046] 4. The present invention further does not distinguish between the two connecting pipes during heating operation. Since the outdoor throttling device is always turned on and the indoor throttling device is turned off during heating, the temperature at the first connecting pipe is slightly lower than the temperature at the second connecting pipe (the two temperatures are close). The temperatures at the first and second connecting pipes are both slightly lower than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than △T and T2 is less than T2 within a continuous △t period, 环 -10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period,环 -10℃, it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions during heating operation are not distinguished and the temperature is not detected. It is more accurate to judge which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a system structure diagram of the air conditioning unit of the present invention;

[0048] Figure 2 is a structural diagram of a connecting pipe portion of an air conditioning unit of the present invention;

[0049] Figure 3 yes Figure 2 Cross-sectional view at the temperature sensor.

[0050] The reference numerals are:

[0051] 1. Outdoor unit; 2. Indoor unit; 3. Connecting pipe; 4. Temperature sensor; 5. First connecting pipe; 6. Second connecting pipe; 7. Compressor; 8. Outdoor heat exchanger; 9. First throttling device; 10. Indoor heat exchanger; 11. Second throttling device; 12. Four-way valve; 13. Gas-liquid separator; 14. Compressor heating belt; 15. Outdoor fan; 16. Outdoor filter; 17. Indoor filter; 18. Indoor fan; 19. Refrigerant sensor. DETAILED DESCRIPTION

[0052] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0058] like Figure 1-3As shown, the present invention provides an air conditioning unit, which includes:

[0059] An outdoor unit 1 and an indoor unit 2, wherein the outdoor unit 1 is connected to the indoor unit 2 through a connecting pipe 3, and a temperature sensor 4 and a switching component are provided on the connecting pipe 3, wherein the temperature sensor 4 can detect the temperature of the refrigerant in the connecting pipe 3, and the switching component can control the connecting pipe 3 to be connected or disconnected, wherein the refrigerant can pass normally in the connecting pipe 3 when connected, and the refrigerant cannot pass normally in the connecting pipe 3 when disconnected, and t is set as a continuous time period, and the temperature detected by the temperature sensor 4 at the beginning of time t is T1, and the temperature detected at the end of time t is T2, and if T1-T2 is greater than △T and T2 is less than T in the continuous t period, 环 +T 系数 , it is determined that there is refrigerant leakage at the connecting pipe, and the on-off component is controlled to disconnect the connecting pipe 3, where ΔT is a preset temperature difference, T 环 is the outdoor ambient temperature, T 系数 is the temperature coefficient.

[0060] The invention connects the outdoor unit and the indoor unit of the air conditioner unit through a connecting pipe, and arranges a temperature sensor and a switching component on the connecting pipe, so as to detect the refrigerant temperature in the connecting pipe, and judge whether there is a refrigerant leakage at the connecting pipe according to the relationship between the refrigerant temperature in the connecting pipe and the outdoor environment temperature, especially when T1-T2 is greater than △T and T2 is less than T in a continuous period of t. 环 +T 系数 When it is determined that there is a refrigerant leakage at the connecting pipe, it can accurately and precisely determine whether there is a refrigerant leakage, and when it is determined that there is a leakage, the on-off component is controlled to disconnect the connecting pipe, thereby effectively preventing the refrigerant leakage from occurring and improving the accuracy of preventing the refrigerant leakage.

[0061] In some embodiments,

[0062] The connecting pipe 3 includes a first connecting pipe 5 and a second connecting pipe 6, the outdoor unit 1 includes a compressor 7, an outdoor heat exchanger 8 and a first throttling device 9, the indoor unit 2 includes an indoor heat exchanger 10 and a second throttling device 11, the first connecting pipe 5 is connected between the first throttling device 9 and the second throttling device 11, the second connecting pipe 6 is connected between the compressor 7 and the indoor heat exchanger 10, and the outdoor heat exchanger 8 can be connected to the indoor heat exchanger 10 through the first throttling device 9, the first connecting pipe 5 and the second throttling device 11 in sequence; the temperature sensor 4 is arranged on the first connecting pipe 5 and / or the second connecting pipe 6, and the on-off components are arranged on both the first connecting pipe 5 and the second connecting pipe 6.

[0063] This is the preferred structural form of the connecting pipe of the present invention, that is, it includes a first connecting pipe connected between the outdoor throttling device and the indoor throttling device and a second connecting pipe connected between the compressor and the indoor heat exchanger, and at least one of the two connecting pipes is provided with a temperature sensor, which can sense the temperature of the refrigerant in the connecting pipe and the outdoor ambient temperature, so as to effectively judge whether there is a refrigerant leakage in the connecting pipe at that location, and the on-off components provided on the two connecting pipes can be closed in time when refrigerant leakage occurs, preferably preventing the refrigerant from leaking out of the pipe.

[0064] like Figure 1 As shown, it shows the structure of the air conditioner involved in the present invention, including an outdoor unit 1, an indoor unit 2, and two connecting pipes. The outdoor unit body includes an outdoor fan 15, an outdoor heat exchanger 8, an electronic expansion valve (first throttling device 9), a compressor 7, a gas-liquid separator 13 and a four-way valve 12. The indoor unit body includes an indoor fan 18, an indoor heat exchanger 10, and a refrigerant sensor 19.

[0065] In some embodiments,

[0066] When the air conditioning unit is in standby mode and the first connecting pipe 5 is provided with a temperature sensor 4, T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are both controlled to be disconnected, cutting off the refrigerant to prevent the refrigerant from continuing to leak from the first connecting pipe 5;

[0067] When the air conditioning unit is in standby mode and the temperature sensor 4 is provided on the second connecting pipe 6, T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant and prevent the refrigerant from continuing to leak from the first connecting pipe 5.

[0068] The present invention further does not distinguish between the two connecting pipes during standby. When a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than ΔT and T2 is less than T in a continuous Δt period, 环 , that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环, it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions are not distinguished and the temperature is not detected when in standby mode. It is more accurately determined which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0069] In some embodiments,

[0070] When the air conditioning unit is in cooling operation and the first connecting pipe 5 is provided with a temperature sensor 4, T 系数 =10℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 +10°C, i.e., it is judged that there is refrigerant leakage at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe 5;

[0071] When the air conditioning unit is in cooling operation and the temperature sensor 4 is provided on the second connecting pipe 6, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10℃, that is, it is judged that there is refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant to prevent the refrigerant from continuing to leak from the second connecting pipe 6.

[0072] The present invention further distinguishes the two connecting pipes during refrigeration operation. Since the indoor throttling device is turned on and the outdoor throttling device is turned off during refrigeration, the temperature at the first connecting pipe is greater than the temperature at the second connecting pipe. The temperature at the first connecting pipe is slightly higher than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 +10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe. Therefore, the positions of the connecting pipes at two different positions during refrigeration operation are distinguished and the temperature is detected, so that it is more accurately determined which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0073] When a temperature sensor is arranged on the second connecting pipe of the present invention, if it is detected within a continuous △t that T1-T2 is greater than △T and T2 is less than T 环 -10℃ (the temperature at the second connecting pipe is slightly lower than the ambient temperature during normal refrigeration operation), it is judged that there is refrigerant leakage at the second connecting pipe, and the positions of the connecting pipes at two different positions during refrigeration operation are distinguished and the temperature is detected, so as to more accurately determine which connecting pipe has refrigerant leakage, thereby further improving the accuracy of preventing refrigerant leakage.

[0074] In some embodiments,

[0075] When the air conditioning unit is in heating operation, and when the first connecting pipe 5 is provided with a temperature sensor 4, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10°C, i.e., it is judged that there is refrigerant leakage at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are both controlled to be disconnected, cutting off the refrigerant to prevent the refrigerant from continuing to leak from the first connecting pipe 5;

[0076] When the air conditioner is in heating operation, and when the temperature sensor 4 is provided on the second connecting pipe 6, T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10℃, that is, it is judged that there is refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant to prevent the refrigerant from continuing to leak from the second connecting pipe 6.

[0077] The present invention further does not distinguish between the two connecting pipes during heating operation. Since the outdoor throttling device is always turned on and the indoor throttling device is turned off during heating, the temperature at the first connecting pipe is slightly lower than the temperature at the second connecting pipe (the two temperatures are close). The temperatures at the first and second connecting pipes are both slightly lower than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than △T and T2 is less than T2 within a continuous △t period, the temperature at the first connecting pipe is slightly lower than the ambient temperature. 环 -10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 -10℃, it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions during heating operation are not distinguished and the temperature is not detected. It is more accurate to judge which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0078] In some embodiments,

[0079] When the air-conditioning unit is cooling, the second throttling device 11 throttles, and the first throttling device 9 does not throttle; when the air-conditioning unit is heating, the first throttling device 9 throttles, and the second throttling device 11 does not throttle.

[0080] This is the preferred structure and control form of cooling and heating of the present invention. During cooling, only the indoor throttling device is turned on, so that the refrigerant enters the indoor unit in a state with a relatively large proportion of gas after condensing and releasing heat through the outdoor heat exchanger, and is throttled to a liquid state in the indoor unit, which can increase the flow rate of the gas refrigerant flowing into the indoor unit, increase the refrigerant flow rate, and avoid the process loss of the liquid refrigerant; and during heating, only the outdoor throttling device is turned on, so that the refrigerant enters the outdoor unit in a state with a relatively large proportion of gas after condensing and releasing heat through the indoor heat exchanger, and is throttled to a liquid state in the outdoor unit, which can increase the flow rate of the gas refrigerant flowing into the outdoor unit, increase the refrigerant flow rate, and avoid the process loss of the liquid refrigerant.

[0081] In some embodiments,

[0082] The range of △t is 0 to 5 seconds, △T is 5 to 10℃, T 环 The range is 20±5℃.

[0083] This is the time △t, the preset temperature difference △T and T of the present invention. 环 The preferred numerical range of .

[0084] In some embodiments,

[0085] A plurality of the temperature sensors 4 can be arranged on the first connecting tube 5 at intervals along the circumferential direction; a plurality of the temperature sensors 4 can be arranged on the second connecting tube 6 at intervals along the circumferential direction; the first connecting tube 5 and the second connecting tube 6 are both provided with the on-off components, which are conductive when power is off and the refrigerant can flow normally, and are cut off when power is on and the refrigerant cannot flow normally.

[0086] The present invention can further improve the accuracy and uniformity of temperature detection of the refrigerant connecting pipe by means of multiple temperature sensors arranged circumferentially on the first connecting pipe, thereby avoiding the occurrence of inaccurate temperature detection due to factors such as sudden temperature changes at a certain location; both connecting pipes preferably have their own on-off components, which can automatically control the on-off of the connecting pipes according to the temperature range, thereby avoiding refrigerant leakage.

[0087] The connecting pipe of the present invention is made of threaded copper, one side of which is connected to the outdoor unit electronic expansion valve or the outdoor unit four-way valve, and the other side is connected to the indoor unit heat exchanger inlet pipe or the indoor unit heat exchanger outlet pipe. Figure 2 The connecting pipe preferably has a temperature sensing element (temperature sensor 4) embedded in the main body, and the two temperature sensing elements are placed at 180 degrees. Figure 3As shown (there can be 3 temperature sensing elements placed at 120°, or 4 temperature sensing elements placed at 90°). The temperature sensing element has its own lead wire, which is connected to the indoor unit mainboard. If there is only one temperature sensing element, refrigerant leakage occurs on the side without the temperature sensing element, and the distance is too far, so the timeliness of refrigerant leakage detection cannot be guaranteed. The connecting pipe is preferably equipped with a disconnection component, which is conductive when power is lost and the refrigerant can flow normally; it is cut off when power is received and the refrigerant cannot flow normally.

[0088] The present invention also provides a control method for the air conditioning unit as described above, comprising:

[0089] A detection step, detecting the refrigerant temperature in the connecting pipe 3 as T1 at the beginning of time t, detecting the refrigerant temperature in the connecting pipe 3 as T2 at the end of time t, and detecting the outdoor environment temperature Tring;

[0090] Control step: if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous period of t 环 +T 系数 When the refrigerant leaks at the connecting pipe, it is determined that there is a refrigerant leak at the connecting pipe, and the on-off component is controlled to disconnect the connecting pipe 3.

[0091] The present invention determines whether there is a refrigerant leak at the location by the relationship between the refrigerant temperature in the connecting pipe and the outdoor ambient temperature, especially when T1-T2 is greater than △T and T2 is less than Tring+T in a continuous period of t. 系数 When it is determined that there is a refrigerant leakage at the connecting pipe, it can accurately and precisely determine whether there is a refrigerant leakage, and when it is determined that there is a leakage, the on-off component is controlled to disconnect the connecting pipe, thereby effectively preventing the refrigerant leakage from occurring and improving the accuracy of preventing the refrigerant leakage.

[0092] In some embodiments,

[0093] When the connecting pipe 3 includes a first connecting pipe 5 and a second connecting pipe 6:

[0094] When the air conditioning unit is in standby mode and the first connecting pipe 5 is provided with a temperature sensor 4, the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 , it is determined that there is a refrigerant leak at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant;

[0095] When the air conditioning unit is in standby mode and the temperature sensor 4 is provided on the second connecting pipe 6, the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环, that is, it is determined that there is a refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant.

[0096] In the standby state, the present invention collects temperature signals T in chronological order and transmits them to the indoor unit mainboard for storage and processing. If T1-T2 (T2 is the temperature detected after T1 passes △t) is greater than △T and T2 is less than T 环 (The temperature drop indicates refrigerant leakage. Refrigerant vaporizes and absorbs heat. The greater the leakage, the more accurate it is). It is determined that there is refrigerant leakage at the connecting pipe. The indoor unit mainboard controls the first and second connecting pipe on-off components to be energized, cuts off the refrigerant, and prevents the refrigerant from continuing to leak from the connecting pipe. At the same time, the indoor unit mainboard transmits the connecting pipe refrigerant leakage signal to the outdoor unit mainboard. The unit is protected and cannot start normally. Only the indoor fan is forced to start and run at the maximum speed, waiting for the connecting pipe to be repaired. Here, △t ranges from 0 to 5 seconds, △T is 5 to 10℃, and T 环 The temperature is ambient, preferably 20°C.

[0097] In some embodiments,

[0098] When the connecting pipe 3 includes a first connecting pipe 5 and a second connecting pipe 6:

[0099] When the air conditioning unit is in cooling operation and the first connecting pipe 5 is provided with a temperature sensor 4, the control step, T 系数 =10℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 +10°C, it is determined that there is refrigerant leakage at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant;

[0100] When the air conditioning unit is in cooling operation and the temperature sensor 4 is provided on the second connecting pipe 6, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 If the temperature is -10℃, it is determined that there is refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant.

[0101] The present invention further distinguishes the two connecting pipes during refrigeration operation. Since the indoor throttling device is turned on and the outdoor throttling device is turned off during refrigeration, the temperature at the first connecting pipe is greater than the temperature at the second connecting pipe. The temperature at the first connecting pipe is slightly higher than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period,环 +10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 -10℃ (the temperature at the second connecting pipe is slightly lower than the ambient temperature during normal refrigeration operation), it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions during refrigeration operation are distinguished and the temperatures are detected, so that it is more accurately determined which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0102] During the refrigeration operation of the present invention, the temperature signal T is collected in time sequence and transmitted to the indoor unit main board for storage and processing. 环 +10℃, it is determined that there is a refrigerant leak at the connecting pipe (the temperature at the first connecting pipe will be slightly higher than the outdoor environment), and the indoor unit mainboard controls the first and second connecting pipe on-off components to be energized to cut off the refrigerant to prevent the refrigerant from continuing to leak from the connecting pipe. At the same time, the indoor unit mainboard transmits the connecting pipe refrigerant leakage signal to the outdoor unit mainboard, and the unit is shut down for protection. Only the indoor fan is forced to start and run at the maximum speed. The indoor unit mainboard sound and light alarm and the mobile phone APP vibration alarm last for 3 minutes to remind the user to repair in time. When the second connecting pipe 6 position detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t 环 -10℃, that is, it is determined that there is a refrigerant leak in the connecting pipe (the temperature at the second connecting pipe 6 will be slightly lower than the outdoor environment during refrigeration). The indoor unit mainboard controls the first and second connecting pipe on-off components to be energized, cuts off the refrigerant, and prevents the refrigerant from continuing to leak from the connecting pipe. At the same time, the indoor unit mainboard transmits the connecting pipe refrigerant leakage signal to the outdoor unit mainboard, and the unit is shut down for protection. Only the indoor fan is forced to start and run at the maximum speed. The indoor unit mainboard sound and light alarm and the mobile phone APP vibration alarm last for 3 minutes to remind the user to repair in time. Here, △t ranges from 0 to 3 seconds, △T is 5 to 10℃, T 环 The temperature is ambient, preferably 20°C.

[0103] In some embodiments,

[0104] When the connecting pipe 3 includes a first connecting pipe 5 and a second connecting pipe 6:

[0105] When the air conditioning unit is in heating operation, and when the first connecting pipe 5 is provided with a temperature sensor 4, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环-10°C, it is determined that there is a refrigerant leak at the first connecting pipe 5, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant;

[0106] When the air conditioning unit is in heating operation, and when the temperature sensor 4 is provided on the second connecting pipe 6, the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 -10°C, that is, it is determined that there is refrigerant leakage at the second connecting pipe 6, and the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are controlled to be disconnected to cut off the refrigerant.

[0107] The present invention further does not distinguish between the two connecting pipes during heating operation. Since the outdoor throttling device is always turned on and the indoor throttling device is turned off during heating, the temperature at the first connecting pipe is slightly lower than the temperature at the second connecting pipe (the two temperatures are close). The temperatures at the first and second connecting pipes are both slightly lower than the ambient temperature. Therefore, when a temperature sensor is provided on the first connecting pipe, if it is detected that T1-T2 is greater than △T and T2 is less than T2 within a continuous △t period, the temperature at the first connecting pipe is slightly lower than the ambient temperature. 环 -10℃, that is, it is judged that there is refrigerant leakage at the first connecting pipe; and when a temperature sensor is set on the second connecting pipe, if it detects that T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 -10℃, it is judged that there is refrigerant leakage at the second connecting pipe. Therefore, the positions of the connecting pipes at two different positions during heating operation are not distinguished and the temperature is not detected. It is more accurate to judge which connecting pipe has refrigerant leakage, further improving the accuracy of preventing refrigerant leakage.

[0108] When the present invention is in heating operation, the temperature signal T is collected in time sequence and transmitted to the indoor unit mainboard for storage and processing. 环 -10℃ (when heating, the temperature of the second connecting pipe 6 is usually around 40°, the temperature of the first connecting pipe 5 is similar to the temperature of the second connecting pipe 6, the outdoor electronic expansion valve throttles during heating, and the indoor electronic expansion valve throttles during cooling), that is, it is determined that there is a refrigerant leak at the connecting pipe, and the indoor unit mainboard controls the first and second connecting pipe on-off components to be energized to cut off the refrigerant to prevent the refrigerant from continuing to leak from the connecting pipe. At the same time, the indoor unit mainboard transmits the connecting pipe refrigerant leakage signal to the outdoor unit mainboard, the unit is shut down for protection, and only the indoor fan is forced to start and run at the maximum speed. The indoor unit mainboard sound and light alarm and the mobile phone APP vibration alarm last for 3 minutes to remind the user to repair in time. Here, △t ranges from 0 to 5 seconds, △T is 5 to 10℃, T 环 The temperature is ambient, preferably 20°C.

[0109] In some embodiments,

[0110] The control step is to control the second throttling device 11 to throttle when the air-conditioning unit is cooling, and the first throttling device 9 is not throttling; the first throttling device 9 is throttling when the air-conditioning unit is heating, and the second throttling device 11 is not throttling;

[0111] In the control step, after the on-off components on the first connecting pipe 5 and the second connecting pipe 6 are disconnected, the fan of the indoor heat exchanger 10 is controlled to be turned on and run at the maximum speed.

[0112] During cooling, the present invention only opens the indoor throttling device, so that the refrigerant enters the indoor unit in a state where the gas accounts for a large proportion after flowing through the outdoor heat exchanger for condensation and heat release, and is throttled to become a liquid in the indoor unit, which can increase the flow rate of the gas refrigerant flowing into the indoor unit, increase the refrigerant flow rate, and avoid the process loss of the liquid refrigerant; and during heating, only opens the outdoor throttling device, so that the refrigerant enters the outdoor unit in a state where the gas accounts for a large proportion after flowing through the indoor heat exchanger for condensation and heat release, and is throttled to become a liquid in the outdoor unit, which can increase the flow rate of the gas refrigerant flowing into the outdoor unit, increase the refrigerant flow rate, and avoid the process loss of the liquid refrigerant.

[0113] The present invention also controls the fan of the indoor heat exchanger to turn on and run at the maximum speed after the on-off component disconnects the connecting pipe, so that the refrigerant in the indoor unit can exchange heat to the maximum extent in the indoor heat exchanger, maximize the indoor cooling / heating effect, and avoid the refrigerant flowing to the leaking connecting pipe, thereby further preventing the leakage of the refrigerant.

[0114] The present invention provides an air conditioner unit connecting pipe and control method, which can timely respond to refrigerant leakage in the connecting pipe outside the unit shell to prevent further leakage of refrigerant. Differentiate the refrigerant leakage treatment method according to the unit operation state, give a warning in time, remind the user to repair in time, avoid the accumulation of leaked refrigerant, reach the combustion limit, and reduce safety hazards.

[0115] The present invention can solve the following technical problems:

[0116] 1. The leakage and accumulation of flammable refrigerants poses a risk of combustion and safety hazards;

[0117] 2. There is no refrigerant leakage detection device at the external connecting pipe of the unit shell.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioning unit, characterized in that: include: An outdoor unit (1) and an indoor unit (2), wherein the outdoor unit (1) and the indoor unit (2) are connected via a connecting pipe (3), wherein the connecting pipe (3) is provided with a temperature sensor (4) and a switching component, wherein the temperature sensor (4) can detect the temperature of the refrigerant in the connecting pipe (3), and the switching component can control the connecting pipe (3) to be connected or disconnected, wherein the refrigerant can pass normally through the connecting pipe (3) when connected, and the refrigerant cannot pass normally through the connecting pipe (3) when disconnected, assuming that t is a continuous time period, the temperature detected by the temperature sensor (4) at the beginning of time t is T1, and the temperature detected at the end of time t is T2, and if it is detected within a continuous period of t that T1-T2 is greater than ΔT and T2 is less than T 环 +T 系数 When the temperature of the connecting pipe is lowered, it is determined that there is refrigerant leakage at the connecting pipe, and the on-off component is controlled to disconnect the connecting pipe (3), wherein ΔT is a preset temperature difference, T 环 is the outdoor ambient temperature, T 系数 is the temperature coefficient.

2. The air conditioning unit according to claim 1, characterized in that: The connecting pipe (3) comprises a first connecting pipe (5) and a second connecting pipe (6); the outdoor unit (1) comprises a compressor (7), an outdoor heat exchanger (8) and a first throttling device (9); the indoor unit (2) comprises an indoor heat exchanger (10) and a second throttling device (11); the first connecting pipe (5) is connected between the first throttling device (9) and the second throttling device (11); the second connecting pipe (6) is connected between the compressor (7) and the indoor heat exchanger (10); the outdoor heat exchanger (8) can be connected to the indoor heat exchanger (10) via the first throttling device (9), the first connecting pipe (5) and the second throttling device (11) in sequence; the temperature sensor (4) is arranged on the first connecting pipe (5) and / or the second connecting pipe (6); and the on-off component is arranged on both the first connecting pipe (5) and the second connecting pipe (6).

3. The air conditioning unit according to claim 2, characterized in that: When the air conditioning unit is in standby mode and a temperature sensor (4) is provided on the first connecting pipe (5), T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe (5); When the air conditioning unit is in standby mode and a temperature sensor (4) is provided on the second connecting pipe (6), T 系数 =0℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 , that is, it is determined that there is refrigerant leakage at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe (5).

4. The air conditioning unit according to claim 2, characterized in that: When the air conditioning unit is in cooling operation and a temperature sensor (4) is provided on the first connecting pipe (5), T 系数 =10℃, that is, if T1-T2 is greater than △T and T2 is less than T within a continuous △t period, 环 +10°C, i.e., it is determined that there is refrigerant leakage at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe (5); When the air conditioning unit is in cooling operation and a temperature sensor (4) is provided on the second connecting pipe (6), T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10°C, i.e., it is determined that there is refrigerant leakage at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the second connecting pipe (6).

5. The air conditioning unit according to claim 2, characterized in that: When the air conditioning unit is in heating operation and a temperature sensor (4) is provided on the first connecting pipe (5), T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10°C, i.e., it is determined that there is refrigerant leakage at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the first connecting pipe (5); When the air conditioning unit is in heating operation and a temperature sensor (4) is provided on the second connecting pipe (6), T 系数 = -10°C, that is, if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous △t period 环 -10°C, i.e., it is determined that there is refrigerant leakage at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are both controlled to be disconnected, thereby cutting off the refrigerant and preventing the refrigerant from continuing to leak from the second connecting pipe (6).

6. The air conditioning unit according to claim 2, characterized in that: When the air-conditioning unit is cooling, the second throttling device (11) throttles, and the first throttling device (9) does not throttle; when the air-conditioning unit is heating, the first throttling device (9) throttles, and the second throttling device (11) does not throttle.

7. The air conditioning unit according to claim 1, characterized in that: The range of △t is 0 to 5 seconds, △T is 5 to 10℃, T 环 The range is 20±5℃.

8. The air conditioning unit according to claim 2, characterized in that: A plurality of the temperature sensors (4) can be arranged on the first connecting tube (5) at intervals along the circumferential direction; a plurality of the temperature sensors (4) can be arranged on the second connecting tube (6) at intervals along the circumferential direction; the first connecting tube (5) and the second connecting tube (6) are both provided with the on-off components, which are conductive when power is lost and the refrigerant can flow normally, and are cut off when power is supplied and the refrigerant cannot flow normally.

9. A control method for an air conditioning unit according to any one of claims 1 to 8, characterized in that: include: A detection step, detecting the refrigerant temperature in the connecting pipe (3) as T1 at the beginning of time t, detecting the refrigerant temperature in the connecting pipe (3) as T2 at the end of time t, and detecting the outdoor environment temperature T 环 ; Control step: if it is detected that T1-T2 is greater than △T and T2 is less than T within a continuous period of t 环 +T 系数 When the connection pipe is in the state of leakage of refrigerant, it is determined that there is leakage of refrigerant at the connection pipe, and the on-off component is controlled to disconnect the connection pipe (3).

10. The control method of the air conditioning unit according to claim 9, characterized in that: When the connecting pipe (3) comprises a first connecting pipe (5) and a second connecting pipe (6): When the air conditioning unit is in standby mode and a temperature sensor (4) is provided on the first connecting pipe (5), the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 , it is determined that there is a refrigerant leak at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant; When the air conditioning unit is in standby mode and a temperature sensor (4) is provided on the second connecting pipe (6), the control step, T 系数 =0℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 , that is, it is determined that there is a refrigerant leak at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant.

11. The control method of the air conditioning unit according to claim 9, characterized in that: When the connecting pipe (3) comprises a first connecting pipe (5) and a second connecting pipe (6): When the air conditioning unit is in cooling operation and when a temperature sensor (4) is provided on the first connecting pipe (5), the control step, T 系数 =10℃, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 +10°C, it is determined that there is refrigerant leakage at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant; When the air conditioning unit is in cooling operation and when a temperature sensor (4) is provided on the second connecting pipe (6), the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 If the temperature is lower than -10°C, it is determined that there is refrigerant leakage at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant.

12. The control method of the air conditioning unit according to claim 9, characterized in that: When the connecting pipe (3) comprises a first connecting pipe (5) and a second connecting pipe (6): When the air conditioning unit is in heating operation and when a temperature sensor (4) is provided on the first connecting pipe (5), the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 If the temperature is -10°C, it is determined that there is a refrigerant leak at the first connecting pipe (5), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant; When the air conditioning unit is in heating operation and when a temperature sensor (4) is provided on the second connecting pipe (6), the control step, T 系数 = -10°C, that is, within a continuous △t period, it is detected that T1-T2 is greater than △T and T2 is less than T 环 -10°C, i.e., it is determined that there is refrigerant leakage at the second connecting pipe (6), and the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are controlled to be disconnected to cut off the refrigerant.

13. The control method of the air conditioning unit according to claim 9, characterized in that: When comprising a first connecting pipe (5), a second connecting pipe (6), a first throttling device (9) and a second throttling device (11): The control step is to control the second throttling device (11) to throttle when the air-conditioning unit is cooling, and the first throttling device (9) not to throttle; and to control the first throttling device (9) to throttle when the air-conditioning unit is heating, and the second throttling device (11) not to throttle; In the control step, after the on-off components on the first connecting pipe (5) and the second connecting pipe (6) are disconnected, the fan of the indoor heat exchanger (10) is controlled to be turned on and run at the maximum speed.

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