Air conditioning system, air conditioner and control method of air conditioning system

Abstract

The invention provides an air conditioning system, an air conditioner and a control method of the air conditioning system.The air conditioning system comprises a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, a liquid storage device and a bidirectional pressurizing device; the bidirectional pressurizing device is provided with a first interface and a second interface which are communicated; one end of the outdoor heat exchanger communicates with one end of the throttling device, one end of the indoor heat exchanger communicates with the other end of the throttling device, the other end of the indoor heat exchanger communicates with the first connector, and an air suction port of the compressor communicates with a flow outlet of the liquid storage device. The pipeline of the air conditioning system has a first state during refrigeration and a second state during heating. According to the technical scheme, when refrigerant leakage happens to the air conditioning system, the refrigerant at the leaked position can be sucked into the liquid storage device on the outdoor side to be stored by starting the bidirectional pressurizing device and adjusting the state of the bidirectional pressurizing device and the state of the pipeline of the air conditioning system, and therefore waste of the refrigerant can be avoided, and potential safety hazards are avoided.

Description

Technical Field

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

[0002] The cabinet uses R290 refrigerant, which has a large charge volume. The cabinet is installed on the ground of the house, which is prone to collision and pipe breakage. After the pipe is broken, the refrigerant will leak. The refrigerant leakage will not only reduce the cooling effect of the air conditioner, but also bring safety hazards. In particular, R290 refrigerant is flammable to a certain extent. After leakage, accumulation indoors may cause fire or explosion accidents. It is necessary to quickly discharge the R290 refrigerant to the outside when the pipe is broken, and open the stop valve to reduce the R290 leakage concentration indoors.

[0003] The existing related patent discloses an air conditioner using flammable refrigerant. When the flammable refrigerant leaks, the refrigerant is directly discharged to the outside through the drainage pipe branch and the automatic drainage valve provided on the indoor and outdoor connecting pipes, thereby reducing the indoor leakage. However, the technology still has the following problems: the refrigerant is directly discharged to the outside, the refrigerant in the system is reduced, and the refrigerant is not recycled. Summary of the invention

[0004] Therefore, the present invention provides an air conditioning system, an air conditioner and a control method for the air conditioning system, which can solve the technical problem in the prior art that when the refrigerant in the air conditioning system leaks, it is directly discharged to the outside without being recycled.

[0005] In order to solve the above problems, the present invention provides an air-conditioning system, which includes a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, a liquid storage device and a two-way pressurizing device; the two-way pressurizing device has a first interface and a second interface that are connected to each other; one end of the outdoor heat exchanger is connected to one end of the throttling device, one end of the indoor heat exchanger is connected to the other end of the throttling device, the other end of the indoor heat exchanger is connected to the first interface, and the air intake port of the compressor is connected to the outlet port of the liquid storage device; wherein the pipeline of the air-conditioning system has a first state and a second state; in the first state, the exhaust port of the compressor is connected to the other end of the outdoor heat exchanger, and the inlet port of the liquid storage device is connected to the second interface; in the second state, the exhaust port of the compressor is connected to the second interface, and the inlet port of the liquid storage device is connected to the other end of the outdoor heat exchanger;

[0006] Among them, the bidirectional pressurizing device has state a and state b. In state a, the bidirectional pressurizing device pressurizes the first interface to make the fluid inlet and the second interface to make the fluid outlet. In state b, the bidirectional pressurizing device pressurizes the second interface to make the fluid inlet and the first interface to make the fluid outlet.

[0007] In some embodiments, the bidirectional pressurizing device includes a first pump body and a second pump body, the inlet of the first pump body is connected to the inlet of the second pump body, the outlet of the first pump body serves as the first interface, and the outlet of the second pump body serves as the second interface;

[0008] Wherein, when the bidirectional pressurizing device is in the state a, the first pump body is closed and the second pump body is opened; when the bidirectional pressurizing device is in the state b, the second pump body is closed and the first pump body is opened.

[0009] In some embodiments, the air-conditioning system also includes a four-way valve, and the exhaust port of the compressor, the other end of the outdoor heat exchanger, the inlet of the liquid storage device and the second interface are connected one by one to the four interfaces of the four-way valve; wherein the pipeline of the air-conditioning system is switched between the first state and the second state through the four-way valve.

[0010] In some embodiments, the four-way valve is connected to the second interface through a first a interface, wherein a first stop valve is provided at the first a interface.

[0011] In some embodiments, the liquid storage device is a liquid storage tank;

[0012] And / or, the throttling device is a throttle valve;

[0013] And / or, the throttling device is connected to the indoor heat exchanger via a second a interface, and a second stop valve is provided at the second a interface.

[0014] In some embodiments, the air conditioning system further includes a first detection device, a second detection device and a third detection device.

[0015] The first detection device is used to detect the tube temperature change rate of the indoor heat exchanger;

[0016] The second detection device is used to detect the tube temperature change rate of the outdoor heat exchanger;

[0017] The third detection device is used to detect the operating frequency of the compressor.

[0018] The present invention also provides an air conditioner, which comprises any one of the air conditioning systems described above.

[0019] The present invention also provides a control method for the above-mentioned air conditioning system, which comprises:

[0020] Detect the tube temperature change rate ΔTin of the indoor heat exchanger and the tube temperature change rate ΔTout of the outdoor heat exchanger; if ΔTin is greater than the first preset change rate ΔTimax, and / or ΔTout is greater than the second preset change rate ΔTomax, detect the operating frequency f of the compressor, and determine whether the air-conditioning system has a refrigerant leak based on the operating frequency f of the compressor.

[0021] In some implementations, judging whether refrigerant leakage occurs in the air-conditioning system according to the operating frequency f of the compressor is specifically as follows:

[0022] If f is greater than the first preset value fi and less than the second preset value fm, it is determined that there is no refrigerant leakage in the air-conditioning system; otherwise, it is determined that there is a refrigerant leakage in the air-conditioning system.

[0023] In some embodiments, if the air conditioning system leaks, the relationship between the tube temperature change rate ΔTin of the indoor heat exchanger and the tube temperature change rate ΔTout of the outdoor heat exchanger is determined: wherein,

[0024] If ΔTin is greater than ΔTout and the air conditioning system is operating in the first state, the bidirectional pressurizing device is started and operated in the state a, and the compressor is turned off;

[0025] and / or, if ΔTin is not greater than ΔTout, and the air-conditioning system is operating in the first state, the bidirectional pressurizing device is started, and the bidirectional pressurizing device is operated in the b state, and the pipeline of the air-conditioning system is switched to the second state, and the compressor is turned off;

[0026] and / or, if ΔTin is greater than ΔTout and the air conditioning system is operating in the second state, the bidirectional pressurizing device is started and operated in the b state, and the compressor is turned off;

[0027] And / or, if ΔTin is not greater than ΔTout and the air-conditioning system is operating in the second state, the two-way pressurizing device is started and operated in the a state, the pipeline of the air-conditioning system is switched to the first state, and the compressor is turned off.

[0028] In some embodiments, when the air-conditioning system further includes a four-way valve, the exhaust port of the compressor, the other end of the outdoor heat exchanger, the inlet of the liquid storage device and the second interface are connected to the four interfaces of the four-way valve in a one-to-one correspondence; the pipeline of the air-conditioning system is switched between the first state and the second state through the four-way valve; and the four-way valve is connected to the second interface through the first a interface, and a first stop valve is provided at the first a interface; and the throttling device is a throttling valve, and the throttling device is connected to the indoor heat exchanger through the second a interface, and a second stop valve is provided at the second a interface, if the air-conditioning system leaks, the relationship between the tube temperature change rate ΔTin of the indoor heat exchanger and the tube temperature change rate ΔTout of the outdoor heat exchanger is determined: wherein,

[0029] If ΔTin is greater than ΔTout and the air conditioning system is operating in the first state, the throttle valve is closed to the minimum, the first stop valve is kept open, and the second stop valve is closed;

[0030] and / or, if ΔTin is not greater than ΔTout and the air conditioning system is operating in the first state, the throttle valve is opened to the maximum, the second stop valve is kept open, and the first stop valve is closed;

[0031] and / or, if ΔTin is greater than ΔTout and the air conditioning system is operating in the second state, the throttle valve is opened to the maximum, the second stop valve is kept open, and the first stop valve is closed;

[0032] And / or, if ΔTin is not greater than ΔTout and the air conditioning system is operating in the second state, the throttle valve is closed to the minimum, the first stop valve is kept open, and the second stop valve is closed.

[0033] An air conditioning system, an air conditioner and a control method of the air conditioning system provided by the present invention have the following beneficial effects:

[0034] 1. The present invention provides a two-way pressurizing device. When a refrigerant leaks in the air-conditioning system, the two-way pressurizing device can be turned on and the states of the two-way pressurizing device and the air-conditioning system pipelines can be adjusted. The refrigerant at the leaking site can be sucked into the liquid storage device for storage, thereby avoiding the waste of refrigerant and allowing the refrigerant to be recycled.

[0035] 2. The liquid storage device is generally installed outdoors. By sucking the leaked refrigerant from the indoor side to the liquid storage device outdoors, the leakage concentration of the refrigerant on the indoor side can be reduced, thereby improving the safety and reliability of the air-conditioning system.

[0036] 3. The technical solution of the present invention solves the problem that the prior art lacks a method for detecting different leakage breakpoint locations according to changes in the system's own parameters.

[0037] 4. The technical solution of the present invention also solves the system flow of refrigerant discharged from the indoor side to the outdoor side at different breakpoints, laying the foundation for the development of R290 refrigerant cabinet units. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of the air conditioning system of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the bidirectional pressurizing device of the present invention;

[0041] Figure 3 is a flow path diagram of the refrigerant discharged when the air-conditioning system of the present invention is in cooling and breakpoint 1 occurs;

[0042] Figure 4 It is a flow path diagram of the refrigerant discharged when the air-conditioning system of the present invention is in cooling and breakpoint 2 occurs;

[0043] Figure 5 It is a flow path diagram of the refrigerant discharged when the air-conditioning system of the present invention is in heating mode and breakpoint 1 occurs;

[0044] Figure 6 It is a flow path diagram of the refrigerant discharged when the air-conditioning system of the present invention is in heating mode and breakpoint 2 occurs;

[0045] Figure 7 It is a schematic diagram of the control logic of pipeline breakpoint position detection during refrigeration operation of the air-conditioning system of the present invention;

[0046] Figure 8 It is a schematic diagram of pipeline breakpoint position detection control logic when the air-conditioning system of the present invention is in heating operation.

[0047] The accompanying drawings are marked as follows:

[0048] 1. compressor; 2. four-way valve; 3. outdoor heat exchanger; 4. throttling device; 5. indoor heat exchanger; 6. two-way pressurizing device; 7. liquid storage device; 8. first stop valve; 9. second stop valve; 11. exhaust port of compressor; 12. air intake port of compressor; 21. first a interface; 31. one end of outdoor heat exchanger; 32. the other end of outdoor heat exchanger; 41. one end of throttling device; 42. the other end of throttling device; 51. one end of indoor heat exchanger; 52. the other end of indoor heat exchanger; 61. first interface; 62. second interface; 71. outlet of liquid storage device; 72. inlet of liquid storage device; 421. second a interface; 601. first pump body; 602. second pump body; 601a. ​​outlet of first pump body; 601b. inlet of first pump body; 602a. outlet of second pump body; 602b. inlet of second pump body. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] See also Figure 1 As shown, according to an embodiment of the present invention, an air conditioning system is provided, which includes a compressor 1, an outdoor heat exchanger 3, a throttling device 4, an indoor heat exchanger 5, a liquid storage device 7 and a bidirectional pressurizing device 6. The bidirectional pressurizing device 6 has a first interface 61 and a second interface 62 that are connected. One end 31 of the outdoor heat exchanger is connected to one end 41 of the throttling device. One end 51 of the indoor heat exchanger is connected to the other end 42 of the throttling device, and the other end 52 of the indoor heat exchanger is connected to the first interface 61. The air intake port 12 of the compressor is connected to the outlet port 71 of the liquid storage device. Among them, the pipeline of the air conditioning system has a first state and a second state. In the first state, the exhaust port 11 of the compressor is connected to the other end 32 of the outdoor heat exchanger, and the inlet port 72 of the liquid storage device is connected to the second interface 62. In the second state, the exhaust port 11 of the compressor is connected to the second interface 62, and the inlet port 72 of the liquid storage device is connected to the other end 32 of the outdoor heat exchanger. Among them, when the air conditioning system is running in the first state, the air conditioning system is cooling at this time. When the air conditioning system operates in the second state, the air conditioning system is heating.

[0054] The bidirectional pressurizing device 6 has state a and state b. In state a, the bidirectional pressurizing device 6 pressurizes the first interface 61 to be a fluid inlet and the second interface 62 to be a fluid outlet. In state b, the bidirectional pressurizing device 6 pressurizes the second interface 62 to be a fluid inlet and the first interface 61 to be a fluid outlet.

[0055] In the above example, when there is no refrigerant leakage in the air-conditioning system, the two-way pressurizing device 6 is in a closed state. When there is a refrigerant leakage in the air-conditioning system, the two-way pressurizing device 6 can be turned on to adjust the states of the two-way pressurizing device 6 and the air-conditioning system pipelines, and the refrigerant at the leaking site can be sucked into the liquid storage device 7 for storage, thereby avoiding the waste of refrigerant and allowing the refrigerant to be recycled.

[0056] The liquid storage device 7 is generally arranged on the outdoor side, so that the leakage concentration of the indoor refrigerant is reduced by sucking the refrigerant leaked from the indoor side to the outdoor side, thereby improving the safety and reliability of the air-conditioning system.

[0057] It should be noted here that the refrigerant in the above-mentioned air-conditioning system can be R290 refrigerant.

[0058] In order to realize the function of the aforementioned bidirectional pressurizing device 6, in some embodiments, as shown in the figure, the aforementioned bidirectional pressurizing device 6 may include a first pump body 601 and a second pump body 602. The inlet 601b of the first pump body is connected to the inlet 602b of the second pump body. The outlet 601a of the first pump body serves as the aforementioned first interface 61, and the outlet 602a of the second pump body 602 serves as the aforementioned second interface 62. Wherein, when the bidirectional pressurizing device 6 is in state a, the first pump body 601 is closed and the second pump body 602 is opened, so that the first interface 61 is a fluid inlet and the second interface 62 is a fluid outlet. When the bidirectional pressurizing device 6 is in state b, the second pump body 602 is closed and the first pump body 601 is opened, so that the second interface 62 is a fluid inlet and the first interface 61 is a fluid outlet.

[0059] In some embodiments, Figure 1 As shown, the aforementioned air-conditioning system further includes a four-way valve 2, and the exhaust port 11 of the aforementioned compressor, the other end 32 of the outdoor heat exchanger, the inlet 72 of the liquid storage device, and the second interface 62 are connected to the four interfaces of the four-way valve 2 in a one-to-one correspondence. Among them, the pipeline of the air-conditioning system is switched between a first state and a second state through the four-way valve 2. In the first state, the pipeline of the air-conditioning system communicates the exhaust port 11 of the compressor with the other end 32 of the outdoor heat exchanger through the four-way valve 2, and the inlet 72 of the liquid storage device is communicated with the second interface 62. In the second state, the pipeline of the air-conditioning system communicates the exhaust port 11 of the compressor with the second interface 62 through the four-way valve 2, and the inlet 72 of the liquid storage device is communicated with the other end 32 of the outdoor heat exchanger.

[0060] In the above example, the four-way valve 2 is provided to facilitate the switching of the pipeline of the air-conditioning system between the first state and the second state.

[0061] In some embodiments, Figure 1As shown, the aforementioned four-way valve 2 has a first a-port 21, and the four-way valve 2 is connected to the second port 62 through the first a-port 21. A first stop valve 8 is provided at the first a-port 21.

[0062] Since the pipeline between the second interface 62 and the first a interface 21 is easily broken and refrigerant leakage occurs, the present invention sets a first stop valve 8 at the first a interface 21. Once the pipeline between the second interface 62 and the first a interface 21 is broken and refrigerant leakage occurs, the first stop valve 8 can be closed in time to prevent refrigerant leakage at the first a interface 21.

[0063] In some embodiments, the aforementioned liquid storage device 7 may be a liquid storage tank. The aforementioned throttling device 4 may be a throttling valve, such as an electronic expansion valve.

[0064] In some embodiments, Figure 1 As shown, the aforementioned throttling device 4 has a second a-port 421, through which the throttling device 4 is communicated with the indoor heat exchanger 5. A second stop valve 9 is provided at the second a-port 421.

[0065] Since the pipeline between the second a interface and the indoor heat exchanger 5 is prone to breakage and refrigerant leakage, the present invention sets a second stop valve 9 at the second a interface. Once the pipeline between the second a interface 421 and the indoor heat exchanger 5 breaks and refrigerant leakage occurs, the second stop valve 9 can be closed in time to prevent refrigerant leakage at the second a interface.

[0066] In some embodiments, the aforementioned air conditioning system may further include a first detection device, a second detection device, and a third detection device. The first detection device is used to detect the tube temperature change rate of the indoor heat exchanger 5. The second detection device is used to detect the tube temperature change rate of the outdoor heat exchanger 3. The third detection device is used to detect the operating frequency of the compressor 1.

[0067] In the above example, the first detection device, the second detection device and the third detection device cooperate to detect whether a leak occurs in the air-conditioning system and where the leak occurs, which is conducive to timely handling of the leak.

[0068] It should be noted here that the structures of the first detection device, the second detection device and the third detection device are all prior art and will not be described in detail here.

[0069] In some embodiments, the first detection device may include a first temperature sensing package disposed on the heat exchange tube of the indoor heat exchanger 5, and the first temperature sensing package is used to detect the temperature of the heat exchange tube of the indoor heat exchanger 5. By recording the temperature of the first temperature sensing package in real time, the speed of temperature change of the first temperature sensing package can be calculated, that is, the tube temperature change rate of the indoor heat exchanger 5. Similarly, the second detection device may include a second temperature sensing package disposed on the heat exchange tube of the outdoor heat exchanger 3, and the second temperature sensing package is used to detect the temperature of the heat exchange tube of the outdoor heat exchanger 3. By recording the temperature of the second temperature sensing package in real time, the speed of temperature change of the second temperature sensing package can be calculated, that is, the tube temperature change rate of the outdoor heat exchanger 3.

[0070] For ease of understanding, Figure 1 A schematic diagram of the process of an air conditioning system of the present invention is shown. When the air conditioning system is in normal refrigeration operation, the pipeline of the air conditioning system is in the aforementioned first state, at which time the refrigerant is discharged from the compressor 1, enters the outdoor heat exchanger 3 through the four-way valve 2 for condensation and heat dissipation, and then passes through a throttle valve such as an electronic expansion valve for throttling, and then enters the indoor heat exchanger 5 for evaporation and heat absorption. After the refrigerant comes out of the indoor heat exchanger 5, it passes through the four-way valve 2 and enters the liquid storage tank, and then enters the compressor 1 from the liquid storage tank for further compression, and such a reciprocating cycle completes an air conditioning refrigeration process.

[0071] In some embodiments, the present invention further provides an air conditioner, which may include any of the above-mentioned air conditioning systems. In some embodiments, the above-mentioned air conditioner may be a cabinet air conditioner. Among them, cabinet air conditioners are generally installed on the ground and are prone to collision. When a collision occurs, the air conditioning system is prone to break between the indoor heat exchanger 5 and the throttling device 4, and between the indoor heat exchanger 5 and the four-way valve 2. For the convenience of description, the break point between the indoor heat exchanger 5 and the throttling device 4 is taken as breakpoint 1, and the break point between the indoor heat exchanger 5 and the four-way valve 2 is taken as breakpoint 2. When a refrigerant leaks in the air conditioning system, the refrigerant at the leaking part can be sucked into the liquid storage device 7 for storage by opening the bidirectional pressurizing device 6 and adjusting the respective states of the bidirectional pressurizing device 6 and the air conditioning system pipeline, thereby avoiding the waste of refrigerant and allowing the refrigerant to be recycled.

[0072] like Figure 7-8 As shown, in some embodiments, the present invention further provides a control method for the above-mentioned air conditioning system, which includes:

[0073] Detect the tube temperature change rate ΔTin of the indoor heat exchanger 5 and the tube temperature change rate ΔTout of the outdoor heat exchanger 3; if ΔTin is greater than the first preset change rate ΔTimax, and / or ΔTout is greater than the second preset change rate ΔTomax, detect the operating frequency f of the compressor 1, and determine whether a refrigerant leak occurs in the air-conditioning system based on the operating frequency f of the compressor 1.

[0074] The first preset change rate ΔTimax is the maximum tube temperature change rate of the indoor heat exchanger 5 when the air-conditioning system is in normal operation, and the second preset change rate ΔTomax is the maximum tube temperature change rate of the outdoor heat exchanger 3 when the air-conditioning system is in normal operation. When the tube temperature change rate ΔTin of the indoor heat exchanger 5 is not greater than the first preset change rate ΔTimax, and the tube temperature change rate ΔTout of the outdoor heat exchanger 3 is not greater than the second preset change rate ΔTomax, it means that the tube temperatures of both the indoor heat exchanger 5 and the outdoor heat exchanger 3 of the air-conditioning system are within the normal range of change, indicating that there is no refrigerant leakage in the air-conditioning system at this time, and the air-conditioning system is controlled to continue to operate in the current state.

[0075] When the tube temperature change rate ΔTin of the indoor heat exchanger 5 is greater than the first preset change rate ΔTimax, and / or the tube temperature change rate ΔTout of the outdoor heat exchanger 3 is greater than the second preset change rate ΔTomax, it means that the tube temperature change of at least one of the indoor heat exchanger 5 and the outdoor heat exchanger 3 of the air-conditioning system is abnormal and exceeds the normal tube temperature change range, indicating that the air-conditioning system may have a refrigerant leak at this time, and further judgment is needed based on the operating frequency of the compressor 1.

[0076] Among them, whether the air-conditioning system has refrigerant leakage is determined according to the operating frequency f of the compressor 1, specifically: if f is greater than the first preset value fi and less than the second preset value fm, it is determined that the air-conditioning system has no refrigerant leakage; otherwise, it is determined that the air-conditioning system has refrigerant leakage.

[0077] In the above example, the normal variation range of the operating frequency of compressor 1 is between the first preset value fi and the second preset value fm. If f is greater than fi and less than fm, it means that compressor 1 is within the fluctuation range of normal operation, indicating that there is no refrigerant leakage in the air-conditioning system at this time, and the air-conditioning system is controlled to continue to operate in the current state. If f is greater than or equal to fm, or f is less than or equal to fi, it means that the operating frequency of compressor 1 is not within the normal fluctuation range, indicating that there is a refrigerant leakage in the air-conditioning system at this time.

[0078] Since the air conditioning system of the present invention is prone to breakage between the indoor heat exchanger 5 and the throttling device 4, and between the indoor heat exchanger 5 and the four-way valve 2, for the convenience of description, the break point between the indoor heat exchanger 5 and the throttling device 4 is taken as breakpoint 1, and the break point between the indoor heat exchanger 5 and the four-way valve 2 is taken as breakpoint 2. When the air conditioning system has a refrigerant leak, it is necessary to further detect whether the refrigerant leak occurs at breakpoint 1 or breakpoint 2, so as to facilitate the corresponding control of the air conditioning system and the recovery of the refrigerant.

[0079] If the air conditioning system leaks, the relationship between the tube temperature change rate ΔTin of the indoor heat exchanger 5 and the tube temperature change rate ΔTout of the outdoor heat exchanger 3 is determined: In some embodiments, Figure 3 As shown, when a leak occurs in the air-conditioning system, if ΔTin is greater than ΔTout and the air-conditioning system is operating in the first state, the bidirectional pressurizing device 6 is started and operated in state a, and the compressor 1 is turned off.

[0080] In the above example, if the air conditioning system is running in the first state, it means that the air conditioning system is running in cooling mode. If ΔTin is greater than ΔTout, it means that the temperature fluctuation of the indoor heat exchanger 5 is faster than that of the outdoor heat exchanger 3, indicating that the refrigerant leakage occurs on the pipe between the indoor heat exchanger 5 and the throttling device 4, that is, the refrigerant leakage occurs at the aforementioned breakpoint 1. In this state, the pipeline of the air conditioning system is kept in the first state, and the two-way pressurizing device 6 is started and operated in state a, so that the indoor heat exchanger 5 is on the back pressure side of the two-way pressurizing device 6, and the refrigerant in the indoor heat exchanger 5 is discharged into the liquid storage tank, and the refrigerant leaked from breakpoint 1 is greatly reduced. At this time, the compressor 1 is also turned off to prevent the compressor 1 from continuing to exhaust and leaking.

[0081] Among them, Figure 3 As shown, when the air-conditioning system further includes a first stop valve 8 and a second stop valve 9, and the throttling device 4 is a throttling valve, if ΔTin is greater than ΔTout, and the air-conditioning system is operating in the first state, the throttle valve will be closed to the minimum, the first stop valve 8 will be kept open, and the second stop valve 9 will be closed to prevent the refrigerant from leaking from the breakpoint 1 through the throttle valve.

[0082] In some embodiments, Figure 4 As shown, when a leak occurs in the air-conditioning system, if ΔTin is not greater than ΔTout and the air-conditioning system is operating in the first state, the two-way pressurizing device 6 is started and operated in state b, and the pipeline of the air-conditioning system is switched to the second state, and the compressor 1 is turned off.

[0083] In the above example, if the air conditioning system is running in the first state, it means that the air conditioning system is running in cooling mode. If ΔTin is not greater than ΔTout, it means that the temperature fluctuation of the outdoor heat exchanger 3 is faster than that of the indoor heat exchanger 5, indicating that the refrigerant leakage occurs on the pipeline between the indoor heat exchanger 5 and the four-way valve 2, that is, the refrigerant leakage occurs at the aforementioned breakpoint 2. In this state, the pipeline of the air conditioning system is switched to the aforementioned second state, and the two-way pressurizing device 6 is started at the same time, and the two-way pressurizing device 6 is operated in state b. At this time, the back pressure side of the two-way pressurizing device 6 is air, and the original refrigerant in the pipeline is discharged from the indoor heat exchanger 5 to the outdoor heat exchanger 3 through the air, and then flows into the liquid storage tank, and the refrigerant leaked from the breakpoint 2 is greatly reduced. At this time, the compressor 1 is also turned off to prevent the compressor 1 from continuing to exhaust and leaking.

[0084] Among them, Figure 4 As shown, when the air conditioning system further includes a first stop valve 8 and a second stop valve 9, and the throttling device 4 is a throttling valve, when a leak occurs in the air conditioning system, if ΔTin is not greater than ΔTout, and the air conditioning system is operating in the first state, the throttling valve is also opened to the maximum, and the second stop valve 9 is kept open to ensure that the refrigerant is smoothly discharged from the indoor heat exchanger 5 to the outdoor heat exchanger 3. At this time, the first stop valve 8 is also closed to avoid refrigerant leakage at the four-way valve 2.

[0085] In some embodiments, Figure 6 As shown, when a leak occurs in the air-conditioning system, if ΔTin is greater than ΔTout and the air-conditioning system is operating in the second state, the bidirectional pressurizing device 6 is started and operated in state b, and the compressor 1 is turned off.

[0086] In the above example, if the air conditioning system is running in the second state, it means that the air conditioning system is running in heating mode. If ΔTin is greater than ΔTout, it means that the temperature fluctuation of the indoor heat exchanger 5 is faster than that of the outdoor heat exchanger 3, indicating that the refrigerant leakage occurs on the pipeline between the indoor heat exchanger 5 and the four-way valve 2, that is, the refrigerant leakage occurs at the aforementioned breakpoint 2. In this state, the pipeline of the air conditioning system is kept in the second state, and the two-way pressurizing device 6 is started at the same time, and the two-way pressurizing device 6 is operated in state b. The back pressure side of the two-way pressurizing device 6 is air, and the original refrigerant in the pipeline is discharged from the indoor heat exchanger 5 to the outdoor heat exchanger 3 through the air, and then flows into the liquid storage tank, and the refrigerant leaked from the breakpoint 2 is greatly reduced. At this time, the compressor 1 is also turned off to prevent the compressor 1 from continuing to exhaust and leaking.

[0087] Among them, Figure 6As shown, when the air conditioning system further includes a first stop valve 8 and a second stop valve 9, and the throttling device 4 is a throttling valve, when a leak occurs in the air conditioning system, if ΔTin is greater than ΔTout, and the air conditioning system is operating in the second state, the throttling valve is also opened to the maximum, and the second stop valve 9 is kept open to ensure that the refrigerant is smoothly discharged from the indoor heat exchanger 5 to the outdoor heat exchanger 3. At this time, the first stop valve 8 is also closed to avoid refrigerant leakage at the four-way valve 2.

[0088] In some embodiments, Figure 5 As shown, when a leak occurs in the air-conditioning system, if ΔTin is not greater than ΔTout, and the air-conditioning system is operating in the second state, the two-way pressurizing device 6 is started, and the two-way pressurizing device 6 is operated in state a, and the pipeline of the air-conditioning system is switched to the first state, and the compressor 1 is turned off.

[0089] In the above example, if the air conditioning system is running in the second state, it means that the air conditioning system is running in heating mode. If ΔTin is not greater than ΔTout, it means that the temperature fluctuation of the outdoor heat exchanger 3 is faster than that of the indoor heat exchanger 5, indicating that the refrigerant leakage occurs on the pipeline between the indoor heat exchanger 5 and the throttling device 4, that is, the refrigerant leakage occurs at the aforementioned breakpoint 1. In this state, the pipeline of the air conditioning system is switched to the first state, and the two-way pressurizing device 6 is started at the same time, and the two-way pressurizing device 6 is operated in state a, so that the indoor heat exchanger 5 is on the back pressure side of the two-way pressurizing device 6, and the refrigerant in the indoor heat exchanger 5 is discharged into the liquid storage tank, and the refrigerant leaked from the breakpoint 1 is greatly reduced. At this time, the compressor 1 is also turned off to prevent the compressor 1 from continuing to exhaust and leaking.

[0090] Among them, Figure 5 As shown, when the air-conditioning system further includes a first stop valve 8 and a second stop valve 9, and the throttling device 4 is a throttling valve, when a leak occurs in the air-conditioning system, if ΔTin is not greater than ΔTout, and the air-conditioning system is operating in the second state, the throttle valve will be closed to the minimum, and the first stop valve 8 will be kept open, and the second stop valve 9 will be closed to prevent the refrigerant from leaking from the breakpoint 1 through the throttle valve.

[0091] It should be noted here that the first stop valve 8 and the second stop valve 9 can both be closed manually.

[0092] Among them, the connecting pipe between the indoor heat exchanger 5 and the throttling device 4 is a small pipe, and the connecting pipe between the indoor heat exchanger 5 and the four-way valve 2 is a large pipe. When the small pipe or the large pipe breaks and refrigerant leaks, the two-way pressurizing device 6 can be used to pressurize, increase the active pressurization on the low-pressure side, increase the refrigerant flow rate, and use the front and rear pressure difference to discharge the refrigerant of the indoor heat exchanger 5 into the liquid storage tank, and close the corresponding stop valve to achieve the purpose of reducing the refrigerant concentration on the indoor side. Among them, the refrigerant in the air-conditioning system can be R290 refrigerant. The technical solution of the present invention solves the accumulation of the refrigerant leakage concentration on the indoor side, and can quickly discharge the refrigerant to the outdoor side and cut off, reducing the refrigerant leakage concentration on the indoor side; it also solves the waste of refrigerant, and the refrigerant can be recycled into the liquid storage tank, and the refrigerant can be recycled; it also solves the lack of a method for detecting different leakage breakpoint positions according to the changes in the system's own parameters in the prior art; it also solves the system flow of refrigerant discharged from the indoor side to the outdoor side at different breakpoint positions, laying a foundation for the development of R290 refrigerant cabinets.

[0093] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0094] 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 system, characterized in that: The invention comprises a compressor (1), an outdoor heat exchanger (3), a throttling device (4), an indoor heat exchanger (5), a liquid storage device (7) and a bidirectional pressurizing device (6); the bidirectional pressurizing device (6) has a first interface (61) and a second interface (62) which are connected to each other; one end (31) of the outdoor heat exchanger is connected to one end (41) of the throttling device, one end (51) of the indoor heat exchanger is connected to the other end (42) of the throttling device, the other end (52) of the indoor heat exchanger is connected to the first interface (61), and the compressor The air intake port (12) is in communication with the outlet port (71) of the liquid storage device; wherein the pipeline of the air conditioning system has a first state and a second state; in the first state, the exhaust port (11) of the compressor is in communication with the other end (32) of the outdoor heat exchanger, and the inlet port (72) of the liquid storage device is in communication with the second interface (62); in the second state, the exhaust port (11) of the compressor is in communication with the second interface (62), and the inlet port (72) of the liquid storage device is in communication with the other end (32) of the outdoor heat exchanger; The bidirectional pressurizing device (6) has a state a and a state b. When in state a, the bidirectional pressurizing device (6) applies pressure so that the first interface (61) is a fluid inlet and the second interface (62) is a fluid outlet. When in state b, the bidirectional pressurizing device (6) applies pressure so that the second interface (62) is a fluid inlet and the first interface (61) is a fluid outlet.

2. The air conditioning system according to claim 1, characterized in that: The bidirectional pressurizing device (6) comprises a first pump body (601) and a second pump body (602), wherein the inlet (601b) of the first pump body is connected to the inlet (602b) of the second pump body, the outlet (601a) of the first pump body serves as the first interface (61), and the outlet (602a) of the second pump body serves as the second interface (62); Wherein, when the bidirectional pressurizing device (6) is in the state a, the first pump body (601) is closed and the second pump body (602) is opened; when the bidirectional pressurizing device (6) is in the state b, the second pump body (602) is closed and the first pump body (601) is opened.

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a four-way valve (2), wherein the exhaust port (11) of the compressor, the other end (32) of the outdoor heat exchanger, the inlet port (72) of the liquid storage device and the second interface (62) are connected to four interfaces of the four-way valve (2) in a one-to-one correspondence; wherein the pipeline of the air conditioning system is switched between the first state and the second state via the four-way valve (2).

4. The air conditioning system according to claim 3, characterized in that: The four-way valve (2) is in communication with the second interface (62) via the first a interface (21), wherein a first stop valve (8) is provided at the first a interface (21).

5. The air conditioning system according to claim 1, characterized in that: The liquid storage device (7) is a liquid storage tank; and / or, the throttling device (4) is a throttle valve; And / or, the throttling device (4) is connected to the indoor heat exchanger (5) via a second a interface (421), and a second stop valve (9) is provided at the second a interface (421).

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: Also includes a first detection device, a second detection device and a third detection device, The first detection device is used to detect the tube temperature change rate of the indoor heat exchanger (5); The second detection device is used to detect the tube temperature change rate of the outdoor heat exchanger (3); The third detection device is used to detect the operating frequency of the compressor (1).

7. An air conditioner, characterized in that: An air conditioning system comprising any one of claims 1-6.

8. A method for controlling an air conditioning system according to claim 6, characterized in that: include: Detecting a tube temperature change rate ΔTin of the indoor heat exchanger (5) and a tube temperature change rate ΔTout of the outdoor heat exchanger (3); If ΔTin is greater than a first preset change rate ΔTimax, and / or ΔTout is greater than a second preset change rate ΔTomax, the operating frequency f of the compressor (1) is detected, and it is determined whether a refrigerant leak occurs in the air-conditioning system based on the operating frequency f of the compressor (1).

9. The control method of the air conditioning system according to claim 8, characterized in that: The step of judging whether a refrigerant leak occurs in the air-conditioning system according to the operating frequency f of the compressor (1) is specifically as follows: If f is greater than the first preset value fi and less than the second preset value fm, it is determined that there is no refrigerant leakage in the air-conditioning system; otherwise, it is determined that there is a refrigerant leakage in the air-conditioning system.

10. The control method of the air conditioning system according to claim 8 or 9, characterized in that: If the air conditioning system leaks, the relationship between the tube temperature change rate ΔTin of the indoor heat exchanger (5) and the tube temperature change rate ΔTout of the outdoor heat exchanger (3) is determined: If ΔTin is greater than ΔTout and the air conditioning system is operating in the first state, the bidirectional pressurizing device (6) is started and the bidirectional pressurizing device (6) is operated in the state a, and the compressor (1) is turned off; and / or, if ΔTin is not greater than ΔTout and the air-conditioning system is operating in the first state, the bidirectional pressurizing device (6) is started, and the bidirectional pressurizing device (6) is operated in the b state, and the pipeline of the air-conditioning system is switched to the second state, and the compressor (1) is turned off; and / or, if ΔTin is greater than ΔTout and the air conditioning system is operating in the second state, the bidirectional pressurizing device (6) is started, and the bidirectional pressurizing device (6) is operated in the b state, and the compressor (1) is turned off; And / or, if ΔTin is not greater than ΔTout and the air-conditioning system is operating in the second state, the bidirectional pressurizing device (6) is started, and the bidirectional pressurizing device (6) is operated in the a state, and the pipeline of the air-conditioning system is switched to the first state, and the compressor (1) is turned off.

11. The control method of the air conditioning system according to claim 8 or 9, characterized in that: When the air conditioning system further comprises a four-way valve (2), the exhaust port (11) of the compressor, the other end (32) of the outdoor heat exchanger, the inlet port (72) of the liquid storage device and the second interface (62) are connected to the four interfaces of the four-way valve (2) in a one-to-one correspondence; the pipeline of the air conditioning system is switched between the first state and the second state through the four-way valve (2); and the four-way valve (2) is connected to the second interface (62) through the first a interface (21), and a first stop valve (8) is provided at the first a interface (21); and the throttling device (4) is a throttling valve, and the throttling device (4) is connected to the indoor heat exchanger (5) through the second a interface (421), and a second stop valve (9) is provided at the second a interface (421), if the air conditioning system leaks, the relationship between the tube temperature change rate ΔTin of the indoor heat exchanger (5) and the tube temperature change rate ΔTout of the outdoor heat exchanger (3) is determined: wherein, If ΔTin is greater than ΔTout and the air conditioning system is operating in the first state, the throttle valve is closed to the minimum, the first stop valve (8) is kept open, and the second stop valve (9) is closed; and / or, if ΔTin is not greater than ΔTout and the air conditioning system is operating in the first state, the throttle valve is opened to the maximum, the second stop valve (9) is kept open, and the first stop valve (8) is closed; and / or, if ΔTin is greater than ΔTout and the air conditioning system is operating in the second state, the throttle valve is opened to the maximum, the second stop valve (9) is kept open, and the first stop valve (8) is closed; And / or, if ΔTin is not greater than ΔTout and the air conditioning system is operating in the second state, the throttle valve is closed to the minimum, the first stop valve (8) is kept open, and the second stop valve (9) is closed.

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