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

Abstract

The application provides an air conditioning system, an air conditioner and a control method of the air conditioning system, wherein 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 has a first interface and a second interface in communication; one end of the outdoor heat exchanger is in communication with one end of the throttling device, one end of the indoor heat exchanger is in communication with the other end of the throttling device, the other end of the indoor heat exchanger is in communication with the first interface, and a suction port of the compressor is in communication with an outlet of the liquid storage device; a pipeline of the air conditioning system has a first state during refrigeration and a second state during heating. According to the technical scheme of the application, when refrigerant leakage occurs in the air conditioning system, the bidirectional pressurizing device can be opened, the states of the bidirectional pressurizing device and the pipeline of the air conditioning system are adjusted, the refrigerant at the leakage position can be sucked into the liquid storage device on the outdoor side for storage, and thus the waste of refrigerant can be avoided, and the safety hazard can be avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioning system, an air conditioner and a control method of the air conditioning system. BACKGROUND

[0002] The cabinet machine adopts R290 refrigerant, and has a large charging amount. The cabinet machine is installed on the ground of a residence, and is prone to collision and pipe breakage. After the pipe is broken, the refrigerant will leak. The refrigerant leakage not only reduces the refrigeration effect of the air conditioner, but also brings safety hazards. In particular, the R290 refrigerant is flammable. After leakage, it may cause fire or explosion accidents. When the pipe is broken, the R290 refrigerant needs to be quickly discharged to the outdoor side, and a stop valve needs to be opened to reduce the R290 leakage concentration on the indoor side.

[0003] The existing related patent discloses an air conditioner using flammable refrigerant. When the flammable refrigerant leakage is detected, the refrigerant is directly discharged to the outdoor side through the discharge pipe branch and the automatic discharge valve arranged on the indoor and outdoor connecting pipeline, so as to reduce the leakage amount in the room. However, the technology still has the following problems: the refrigerant is directly discharged to the outdoor side, and the refrigerant in the system is reduced, and the refrigerant is not recycled. SUMMARY

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

[0005] In order to solve the above problems, the present application provides an air conditioning system, which 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 has a first interface and a second interface in communication; one end of the outdoor heat exchanger is in communication with one end of the throttling device, one end of the indoor heat exchanger is in communication with the other end of the throttling device, the other end of the indoor heat exchanger is in communication with the first interface, and the suction port of the compressor is in communication with the outflow 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 discharge port of the compressor is in communication with the other end of the outdoor heat exchanger, and the inflow port of the liquid storage device is in communication with the second interface; in the second state, the discharge port of the compressor is in communication with the second interface, and the inflow port of the liquid storage device is in communication with the other end of the outdoor heat exchanger;

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

[0007] In some embodiments, the bidirectional pressurizing device comprises a first pump body and a second pump body, an inlet of the first pump body is in communication with an inlet of the second pump body, an outlet of the first pump body is the first interface, and an outlet of the second pump body is the second interface.

[0008] In the state a, the first pump body is closed and the second pump body is opened; 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 further comprises a four-way valve, an outlet of the compressor, the other end of the outdoor heat exchanger, an inlet of the liquid storage device and the second interface are connected to four interfaces of the four-way valve one by one; 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 in communication with the second interface through a first a interface, wherein a first stop valve is arranged at the first a interface.

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

[0012] In some embodiments, the throttling device is a throttle valve.

[0013] In some embodiments, the throttling device is in communication with the indoor heat exchanger through a second a interface, and a second stop valve is arranged at the second a interface.

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

[0015] The first detection device is used for detecting the pipe temperature change rate of the indoor heat exchanger.

[0016] The second detection device is used for detecting the pipe temperature change rate of the outdoor heat exchanger.

[0017] The third detection device is used for detecting the operating frequency of the compressor.

[0018] The application further provides an air conditioner comprising the air conditioning system as described in any one of the above.

[0019] The application further provides a control method of the air conditioning system as described above, which comprises:

[0020] The temperature change rate ΔTin of the indoor heat exchanger and the temperature change rate ΔTout of the outdoor heat exchanger are detected. If ΔTin is greater than the first preset change rate ΔTimax and / or ΔTout is greater than the second preset change rate ΔTomax, the operating frequency f of the compressor is detected, and the refrigerant leakage of the air conditioning system is determined based on the operating frequency f of the compressor.

[0021] In some implementations, determining whether a refrigerant leak has occurred in the air conditioning system based on the compressor's operating frequency f specifically involves:

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

[0023] In some implementations, if a leak occurs in the air conditioning system, the relationship between the temperature change rate ΔTin of the indoor heat exchanger and the temperature change rate ΔTout of the outdoor heat exchanger is determined: where,

[0024] If ΔTin is greater than ΔTout, and the air conditioning system is running in the first state, then the bidirectional pressurization device is activated and the bidirectional pressurization device is run in state a, and the compressor is turned off;

[0025] And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the first state, then the bidirectional pressurization device is activated, and the bidirectional pressurization device is run in the b state, and the piping 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 running in the second state, then the bidirectional pressurization device is activated, and the bidirectional pressurization device is run in the b state, and the compressor is shut down;

[0027] And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the second state, then the bidirectional pressurization device is activated, and the bidirectional pressurization device is run in state a, and the piping 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 compressor's exhaust port, the other end of the outdoor heat exchanger, the inlet of the liquid storage device, and the second interface are connected one-to-one to the four interfaces of the four-way valve; the air conditioning system's piping switches 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 a first a interface, with a first shut-off valve at the first a interface; and the throttling device is a throttling valve, connected to the indoor heat exchanger through a second a interface, with a second shut-off valve at the second a interface, if the air conditioning system leaks, the relationship between the pipe temperature change rate ΔTin of the indoor heat exchanger and the pipe temperature change rate ΔTout of the outdoor heat exchanger is determined: where,

[0029] If ΔTin is greater than ΔTout, and the air conditioning system is running in the first state, then the throttle valve is closed to the minimum, the first shut-off valve remains open, and the second shut-off valve is closed.

[0030] And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the first state, then the throttle valve is opened to the maximum, the second shut-off valve is kept open, and the first shut-off valve is closed;

[0031] And / or, if ΔTin is greater than ΔTout, and the air conditioning system is running in the second state, then the throttle valve is opened to the maximum, the second shut-off valve is kept open, and the first shut-off valve is closed;

[0032] And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is operating in the second state, then the throttle valve is closed to its minimum, the first shut-off valve remains open, and the second shut-off valve is closed.

[0033] The air conditioning system, air conditioner, and control method for the air conditioning system provided by this invention have the following beneficial effects:

[0034] 1. By setting up a bidirectional pressurization device, when a refrigerant leak occurs in the air conditioning system, the bidirectional pressurization device can be activated and the states of the bidirectional pressurization device and the air conditioning system pipeline can be adjusted to draw the refrigerant from the leak into the liquid storage device for storage, thereby avoiding the waste of refrigerant and enabling the refrigerant to be recycled.

[0035] 2. The liquid storage device is generally located on the outdoor side. By drawing the refrigerant leaking from the indoor side to the liquid storage device on the outdoor side, the concentration of refrigerant leaking from the indoor side is 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 existing technology lacks a method for detecting different leakage breakpoint locations based on changes in the system's own parameters.

[0037] 4. The technical solution of this invention also solves the system flow of refrigerant being discharged from the indoor side to the outdoor side at different breakpoint locations, laying the foundation for the development of R290 refrigerant cabinet air conditioners. Attached Figure Description

[0038] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

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

[0040] Figure 2 This is a schematic diagram of the bidirectional pressurization device of the present invention;

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

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

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

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

[0045] Figure 7 This is a schematic diagram of the control logic for detecting and controlling the location of pipe breaks during the cooling operation of the air conditioning system of the present invention;

[0046] Figure 8 This is a schematic diagram of the pipeline breakpoint location detection and control logic during the heating operation of the air conditioning system of the present invention.

[0047] The attached figures are labeled as follows:

[0048] 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Throttling device; 5. Indoor heat exchanger; 6. Two-way pressurization device; 7. Liquid storage device; 8. First shut-off valve; 9. Second shut-off valve; 11. Compressor exhaust port; 12. Compressor suction port; 21. First a-type interface; 31. One end of the outdoor heat exchanger; 32. The other end of the outdoor heat exchanger; 41. One end of the throttling device; 42. The other end of the throttling device; 51. One end of the indoor heat exchanger; 52. The other end of the indoor heat exchanger; 61. First interface; 62. Second interface; 71. Outlet of the liquid storage device; 72. Inlet of the liquid storage device; 421. Second a-type interface; 601. First pump body; 602. Second pump body; 601a. ​​Outlet of the first pump body; 601b. Inlet of the first pump body; 602a. Outlet of the second pump body; 602b. Inlet of the second pump body. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0053] See also Figure 1 As shown, according to an embodiment of the present invention, an air conditioning system is provided, comprising 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 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, and the other end 52 of the indoor heat exchanger is connected to the first interface 61. The compressor's suction port 12 is connected to the liquid storage device's outlet port 71. The air conditioning system's piping has a first state and a second state. In the first state, the compressor's discharge port 11 is connected to the other end 32 of the outdoor heat exchanger, and the liquid storage device's inlet port 72 is connected to the second interface 62. In the second state, the compressor's discharge port 11 is connected to the second interface 62, and the liquid storage device's inlet port 72 is connected to the other end 32 of the outdoor heat exchanger. When the air conditioning system operates in the first state, it cools. When the air conditioning system is running in the second state, it is in heating mode.

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

[0055] In the above example, when there is no refrigerant leak in the air conditioning system, the bidirectional pressurization device 6 is in the closed state. When a refrigerant leak occurs in the air conditioning system, the bidirectional pressurization device 6 can be turned on, and the states of the bidirectional pressurization device 6 and the air conditioning system piping can be adjusted to draw the refrigerant from the leak into the liquid storage device 7 for storage, thereby avoiding refrigerant waste and allowing the refrigerant to be recycled.

[0056] The liquid storage device 7 is generally located on the outdoor side. By drawing the refrigerant leaking from the indoor side to the outdoor side, the concentration of refrigerant leaking from the indoor side is reduced, thereby improving the safety and reliability of the air conditioning system.

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

[0058] To achieve 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. Specifically, in state a, the bidirectional pressurizing device 6 has the first pump body 601 closed and the second pump body 602 open, making the first interface 61 a fluid inlet and the second interface 62 a fluid outlet. In state b, the bidirectional pressurizing device 6 has the second pump body 602 closed and the first pump body 601 open, making the second interface 62 a fluid inlet and the first interface 61 a fluid outlet.

[0059] In some implementations, such as Figure 1 As shown, the aforementioned air conditioning system also includes a four-way valve 2. The compressor's exhaust port 11, the other end 32 of the outdoor heat exchanger, the inlet 72 of the liquid receiver, and the second interface 62 are connected one-to-one to the four interfaces of the four-way valve 2. The air conditioning system's piping switches between a first state and a second state via the four-way valve 2. In the first state, the air conditioning system's piping connects the compressor's exhaust port 11 to the other end 32 of the outdoor heat exchanger and the liquid receiver's inlet 72 to the second interface 62 via the four-way valve 2. In the second state, the air conditioning system's piping connects the compressor's exhaust port 11 to the second interface 62 and the liquid receiver's inlet 72 to the other end 32 of the outdoor heat exchanger via the four-way valve 2.

[0060] In the example above, the four-way valve 2 facilitates the switching of the air conditioning system piping between the first and second states.

[0061] In some implementations, such as Figure 1As shown, the aforementioned four-way valve 2 has a first a port 21, through which the four-way valve 2 is connected to the second port 62. A first shut-off valve 8 is provided at the first a port 21.

[0062] Since the pipe between the second interface 62 and the first a interface 21 is prone to breakage and refrigerant leakage, the present invention provides a first shut-off valve 8 at the first a interface 21. In this way, if the pipe between the second interface 62 and the first a interface 21 breaks and refrigerant leakage occurs, the first shut-off 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 can be a liquid storage tank. The aforementioned throttling device 4 can be a throttling valve, such as an electronic expansion valve.

[0064] In some implementations, such as Figure 1 As shown, the aforementioned throttling device 4 has a second a-port 421, through which the throttling device 4 is connected to the indoor heat exchanger 5. A second shut-off valve 9 is provided at the second a-port 421.

[0065] Since the pipe between the second a port and the indoor heat exchanger 5 is prone to breakage and refrigerant leakage, the present invention provides a second shut-off valve 9 at the second a port. In this way, if the pipe between the second a port 421 and the indoor heat exchanger 5 breaks and refrigerant leakage occurs, the second shut-off valve 9 can be closed in time to prevent refrigerant leakage at the second a port.

[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 rate of change of pipe temperature in the indoor heat exchanger 5. The second detection device is used to detect the rate of change of pipe temperature in the outdoor heat exchanger 3. The third detection device is used to detect the operating frequency of the compressor 1.

[0067] In the example above, the first detection device, the second detection device, and the third detection device work together to detect whether the air conditioning system has leaked and where the leak is located, which is beneficial for timely handling of the leak.

[0068] It should be noted that the structures of the first, second, and third detection devices mentioned above are all existing technologies and will not be described in detail here.

[0069] In some embodiments, the first detection device may include a first temperature sensor mounted on the heat exchange tubes of the indoor heat exchanger 5, which is used to detect the temperature of the heat exchange tubes of the indoor heat exchanger 5. The rate of temperature change of the first temperature sensor can be calculated by recording its temperature in real time, which is the tube temperature change rate of the indoor heat exchanger 5. Similarly, the second detection device may include a second temperature sensor mounted on the heat exchange tubes of the outdoor heat exchanger 3, which is used to detect the temperature of the heat exchange tubes of the outdoor heat exchanger 3. The rate of temperature change of the second temperature sensor can be calculated by recording its temperature in real time, which is the tube temperature change rate of the outdoor heat exchanger 3.

[0070] For ease of understanding, Figure 1 A schematic diagram of the air conditioning system of the present invention is shown. During normal cooling operation, the air conditioning system piping is in the aforementioned first state. At this time, the refrigerant is discharged from the compressor 1, passes through the four-way valve 2 and enters the outdoor heat exchanger 3 for condensation and heat dissipation, then passes through a throttling valve such as an electronic expansion valve for throttling, and then enters the indoor heat exchanger 5 for evaporation and heat absorption. After exiting the indoor heat exchanger 5, the refrigerant passes through the four-way valve 2 and enters the liquid receiver tank, and then enters the compressor 1 from the liquid receiver tank for further compression. This cycle repeats to complete one air conditioning cooling process.

[0071] In some embodiments, the present invention also provides an air conditioner, which may include the air conditioning system described above. In some embodiments, the air conditioner may be a floor-standing air conditioner. Floor-standing air conditioners are generally floor-mounted and prone to collisions. In the event of a collision, the air conditioning system 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 ease of description, the breakage point between the indoor heat exchanger 5 and the throttling device 4 is designated as breakage point 1, and the breakage point between the indoor heat exchanger 5 and the four-way valve 2 is designated as breakage point 2. When refrigerant leakage occurs in the air conditioning system, the refrigerant at the leak point can be drawn into the liquid storage device 7 for storage by activating the bidirectional pressurization device 6 and adjusting the respective states of the bidirectional pressurization device 6 and the air conditioning system piping. This avoids refrigerant waste and allows the refrigerant to be recycled.

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

[0073] The temperature change rate ΔTin of the indoor heat exchanger 5 and the temperature change rate ΔTout of the outdoor heat exchanger 3 are detected. If ΔTin is greater than the first preset change rate ΔTimax and / or ΔTout is greater than the second preset change rate ΔTomax, the operating frequency f of the compressor 1 is detected, and the air conditioning system is judged to have refrigerant leakage based on the operating frequency f of the compressor 1.

[0074] Wherein, the first preset rate of change ΔTimax is the maximum pipe temperature change rate of the indoor heat exchanger 5 under normal operating conditions of the air conditioning system, and the second preset rate of change ΔTomax is the maximum pipe temperature change rate of the outdoor heat exchanger 3 under normal operating conditions of the air conditioning system. When the pipe temperature change rate ΔTin of the indoor heat exchanger 5 is not greater than the first preset rate of change ΔTimax, and the pipe temperature change rate ΔTout of the outdoor heat exchanger 3 is not greater than the second preset rate of change ΔTomax, it indicates that the pipe temperatures of both the indoor heat exchanger 5 and the outdoor heat exchanger 3 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 maintain the current state of operation.

[0075] When the pipe temperature change rate ΔTin of the indoor heat exchanger 5 is greater than the first preset change rate ΔTimax, and / or the pipe temperature change rate ΔTout of the outdoor heat exchanger 3 is greater than the second preset change rate ΔTomax, it indicates that the pipe temperature change of at least one of the indoor heat exchanger 5 and the outdoor heat exchanger 3 in the air conditioning system is abnormal and exceeds the normal pipe temperature change range. This indicates that the air conditioning system may be leaking refrigerant, and further judgment needs to be made based on the operating frequency of the compressor 1.

[0076] Specifically, the air conditioning system is judged to have refrigerant leakage based on the operating frequency f of compressor 1. If f is greater than the first preset value fi and less than the second preset value fm, it is judged that there is no refrigerant leakage in the air conditioning system; otherwise, it is judged that there is refrigerant leakage in the air conditioning system.

[0077] In the example above, the normal operating frequency range 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 indicates that compressor 1 is within the normal operating fluctuation range, meaning that there is no refrigerant leak in the air conditioning system, and the air conditioning system continues to operate in its current state. If f is greater than or equal to fm, or f is less than or equal to fi, it indicates that the operating frequency of compressor 1 is outside the normal fluctuation range, meaning that there is a refrigerant leak in the air conditioning system.

[0078] Because the air conditioning system of this 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 ease of description, the breakage point between the indoor heat exchanger 5 and the throttling device 4 is designated as breakage point 1, and the breakage point between the indoor heat exchanger 5 and the four-way valve 2 is designated as breakage point 2. When refrigerant leakage occurs in the air conditioning system, it is necessary to further detect whether the refrigerant leakage occurs at breakage point 1 or breakage point 2, in order to facilitate appropriate control of the air conditioning system and refrigerant recovery.

[0079] If a leak occurs in the air conditioning system, the relationship between the temperature change rate ΔTin of the indoor heat exchanger 5 and the temperature change rate ΔTout of the outdoor heat exchanger 3 is determined. In some implementations, such as... Figure 3 As shown, when the air conditioning system leaks, if ΔTin is greater than ΔTout and the air conditioning system is running in the first state, the bidirectional pressurization device 6 is activated and runs in state a, while the compressor 1 is shut down.

[0080] In the above example, if the air conditioning system is operating in the first state, it means that the air conditioning system is currently in cooling operation. 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 leak occurs in the pipe between the indoor heat exchanger 5 and the throttling device 4, that is, the refrigerant leak occurs at the aforementioned breakpoint 1. In this state, the air conditioning system piping is kept in the first state. By activating the bidirectional pressurization device 6 and operating it in state a, the indoor heat exchanger 5 is placed on the back pressure side of the bidirectional pressurization device 6. The refrigerant in the indoor heat exchanger 5 is discharged into the liquid receiver, significantly reducing the refrigerant leaking from breakpoint 1. At this time, the compressor 1 is also shut off to prevent the compressor 1 from continuing to discharge and leak.

[0081] Among them, such as Figure 3 As shown, when the air conditioning system also includes a first shut-off valve 8 and a second shut-off valve 9, and the throttling device 4 is a throttling valve, if ΔTin is greater than ΔTout, and the air conditioning system is running in the first state, the throttling valve will be closed to the minimum, the first shut-off valve 8 will remain open, and the second shut-off valve 9 will be closed to prevent the refrigerant from leaking from the break point 1 through the throttling valve.

[0082] In some implementations, such as 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 running in the first state, the bidirectional pressurization device 6 is activated and runs in state b, the air conditioning system piping is switched to the second state, and the compressor 1 is turned off.

[0083] In the above example, if the air conditioning system is operating in the first state, it means that the air conditioning system is currently in cooling operation. 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 leak occurs in the pipe between the indoor heat exchanger 5 and the four-way valve 2, that is, the refrigerant leak occurs at the aforementioned breakpoint 2. In this state, the air conditioning system piping is switched to the aforementioned second state, and the bidirectional pressurization device 6 is started and operated in state b. At this time, the back pressure side of the bidirectional pressurization device 6 is air. The air discharges the original refrigerant in the pipe from the indoor heat exchanger 5 to the outdoor heat exchanger 3, and then flows into the liquid receiver tank, significantly reducing the refrigerant leaking from breakpoint 2. At this time, compressor 1 is also turned off to prevent compressor 1 from continuing to discharge and leak.

[0084] Among them, such as Figure 4 As shown, when the air conditioning system also includes a first shut-off valve 8 and a second shut-off valve 9, and the throttling device 4 is a throttling valve, if a leak occurs in the air conditioning system, and if ΔTin is not greater than ΔTout, and the air conditioning system is running in the first state, the throttling valve will be opened to its maximum, and the second shut-off valve 9 will remain 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 shut-off valve 8 will also be closed to prevent refrigerant leakage at the four-way valve 2.

[0085] In some implementations, such as 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 running in the second state, the bidirectional pressurization device 6 is activated and runs in state b, while the compressor 1 is shut down.

[0086] In the above example, if the air conditioning system is operating in the second state, it indicates that the system is currently 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 leak is occurring in the pipe between the indoor heat exchanger 5 and the four-way valve 2, i.e., at the aforementioned breakpoint 2. In this state, the air conditioning system piping is kept in the second state, and the bidirectional pressurization device 6 is activated and operated in state b. The back pressure side of the bidirectional pressurization device 6 is air, which discharges the original refrigerant in the pipe from the indoor heat exchanger 5 to the outdoor heat exchanger 3, and then flows into the liquid receiver tank, significantly reducing the refrigerant leaking from breakpoint 2. At this time, compressor 1 is also shut off to prevent further leakage due to compressor 1 continuing to discharge.

[0087] Among them, such as Figure 6As shown, when the air conditioning system also includes a first shut-off valve 8 and a second shut-off valve 9, and the throttling device 4 is a throttling valve, if a leak occurs in the air conditioning system and ΔTin is greater than ΔTout, and the air conditioning system is running in the second state, the throttling valve will be opened to its maximum, and the second shut-off valve 9 will remain 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 shut-off valve 8 will also be closed to prevent refrigerant leakage at the four-way valve 2.

[0088] In some implementations, such as Figure 5 As shown, when the air conditioning system leaks, if ΔTin is not greater than ΔTout and the air conditioning system is running in the second state, the bidirectional pressurization device 6 is activated and runs in state a, and the air conditioning system piping is switched to the first state, and the compressor 1 is turned off.

[0089] In the above example, if the air conditioning system is operating in the second state, it indicates that the system is currently 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 leak occurs in the pipe between the indoor heat exchanger 5 and the throttling device 4, i.e., at the aforementioned breakpoint 1. In this state, the air conditioning system piping is switched to the first state, and the bidirectional pressurization device 6 is activated and operated in state a. This places the indoor heat exchanger 5 on the back pressure side of the bidirectional pressurization device 6, and the refrigerant in the indoor heat exchanger 5 is discharged into the liquid receiver, significantly reducing the refrigerant leakage from breakpoint 1. At this time, compressor 1 is also shut down to prevent further leakage from compressor 1.

[0090] Among them, such as Figure 5 As shown, when the air conditioning system also includes a first shut-off valve 8 and a second shut-off valve 9, and the throttling device 4 is a throttling valve, when the air conditioning system leaks, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the second state, the throttling valve will be closed to the minimum, while the first shut-off valve 8 will remain open and the second shut-off valve 9 will be closed to prevent the refrigerant from leaking from the break point 1 through the throttling valve again.

[0091] It should be noted that both the first shut-off valve 8 and the second shut-off valve 9 mentioned above can be closed manually.

[0092] In this invention, the connecting pipe between the indoor heat exchanger 5 and the throttling device 4 is a small pipe, while the connecting pipe between the indoor heat exchanger 5 and the four-way valve 2 is a large pipe. When a refrigerant leak occurs due to a break in either the small or large pipe, the bidirectional pressurizing device 6 can be used to increase the pressure on the low-pressure side, thereby increasing the refrigerant flow rate. The pressure difference between the two sides allows the refrigerant in the indoor heat exchanger 5 to be discharged into the liquid storage tank, and the corresponding shut-off valve is closed, thus reducing the refrigerant concentration on the indoor side. The refrigerant in the air conditioning system can be R290 refrigerant. This invention solves the problem of refrigerant leakage concentration accumulation on the indoor side, allowing for rapid discharge and shut-off of the refrigerant to the outdoor side, reducing the indoor refrigerant leakage concentration. It also solves the problem of refrigerant waste, allowing the refrigerant to be recycled into the liquid storage tank for reuse. Furthermore, it addresses the lack of methods in existing technologies for detecting different leak point locations based on changes in system parameters. Finally, it solves the system flow for refrigerant discharge from the indoor side to the outdoor side at different leak point locations, laying the foundation for the development of R290 refrigerant cabinet air conditioners.

[0093] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0094] The above description is merely 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 principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: It 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) connected together; 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 compressor's... The air intake (12) is connected to the outlet (71) of the liquid storage device; wherein the piping 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 (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 (72) of the liquid storage device is connected to the other end (32) of the outdoor heat exchanger; 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 make it a fluid inlet and the second interface (62) to make it a fluid outlet. In state b, the bidirectional pressurizing device (6) pressurizes the second interface (62) to make it a fluid inlet and the first interface (61) to make it a fluid outlet.

2. The air conditioning system according to claim 1, characterized in that: The bidirectional pressurization device (6) includes 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 first interface (61), and the outlet (602a) of the second pump body serves as the second interface (62). In state a, the bidirectional pressurizing device (6) has the first pump body (601) closed and the second pump body (602) open; in state b, the bidirectional pressurizing device (6) has the second pump body (602) closed and the first pump body (601) open.

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a four-way valve (2), and the compressor's exhaust port (11), the other end of the outdoor heat exchanger (32), the liquid storage device's inlet (72), and the second interface (62) are connected one-to-one to the four interfaces of the four-way valve (2); wherein, the air conditioning system's piping switches between the first state and the second state through the four-way valve (2).

4. The air conditioning system according to claim 3, characterized in that: The four-way valve (2) is connected to the second interface (62) through the first a interface (21), wherein a first shut-off 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 throttling valve; And / or, the throttling device (4) is connected to the indoor heat exchanger (5) through the second a port (421), and a second shut-off valve (9) is provided at the second a port (421).

6. The air conditioning system according to any one of claims 1-5, characterized in that: It 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 rate of change of the pipe temperature 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: The air conditioning system included in any one of claims 1-6.

8. A control method for the air conditioning system of claim 6, characterized in that, include: 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) were detected. If ΔTin is greater than the first preset rate of change ΔTimax, and / or ΔTout is greater than the second preset rate of change ΔTomax, then the operating frequency f of the compressor (1) is detected, and the air conditioning system is judged to have refrigerant leakage based on the operating frequency f of the compressor (1).

9. The control method for an air conditioning system according to claim 8, characterized in that: The method of determining whether the air conditioning system has experienced refrigerant leakage based on the operating frequency f of the compressor (1) is as follows: If f is greater than the first preset value fi and less than the second preset value fm, then it is determined that there is no refrigerant leak in the air conditioning system; otherwise, it is determined that there is a refrigerant leak in the air conditioning system.

10. The control method for an air conditioning system according to claim 8 or 9, characterized in that: If the air conditioning system leaks, determine the relationship between the pipe temperature change rate ΔTin of the indoor heat exchanger (5) and the pipe temperature change rate ΔTout of the outdoor heat exchanger (3): where, If ΔTin is greater than ΔTout, and the air conditioning system is running in the first state, then the bidirectional pressurization device (6) is started, and the bidirectional pressurization device (6) is run in the a state, and the compressor (1) is turned off; And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the first state, then the bidirectional pressurization device (6) is started, and the bidirectional pressurization device (6) is run in the b state, and the piping 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 running in the second state, then the bidirectional pressurization device (6) is started and the bidirectional pressurization device (6) is run 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 running in the second state, then the bidirectional pressurization device (6) is started, and the bidirectional pressurization device (6) is run in state a, and the piping of the air conditioning system is switched to the first state, and the compressor (1) is turned off.

11. The control method for an air conditioning system according to claim 8 or 9, characterized in that: When the air conditioning system also includes a four-way valve (2), the compressor's exhaust port (11), the other end (32) of the outdoor heat exchanger, the inlet (72) of the liquid storage device, and the second interface (62) are connected one-to-one to the four interfaces of the four-way valve (2); the air conditioning system's piping switches 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), where a first shut-off valve (8) is provided; and the throttling device (4) is a throttling valve, which is connected to the indoor heat exchanger (5) through the second a interface (421), where a second shut-off valve (9) is provided; if the air conditioning system leaks, the relationship between the pipe temperature change rate ΔTin of the indoor heat exchanger (5) and the pipe temperature change rate ΔTout of the outdoor heat exchanger (3) is determined: where, If ΔTin is greater than ΔTout, and the air conditioning system is running in the first state, then the throttle valve is closed to the minimum, the first shut-off valve (8) is kept open, and the second shut-off valve (9) is closed. And / or, if ΔTin is not greater than ΔTout, and the air conditioning system is running in the first state, then the throttle valve is opened to the maximum, the second shut-off valve (9) is kept open, and the first shut-off valve (8) is closed; And / or, if ΔTin is greater than ΔTout and the air conditioning system is running in the second state, the throttle valve is opened to the maximum, the second shut-off valve (9) is kept open, and the first shut-off valve (8) is closed; And / or, if ΔTin is not greater than ΔTout and the air conditioning system is running in the second state, then the throttle valve is closed to the minimum, the first shut-off valve (8) is kept open, and the second shut-off valve (9) is closed.

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