Air conditioning system and air conditioner

Abstract

The utility model provides an air conditioning system and an air conditioner, and the air conditioning system comprises a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, the compressor, the indoor heat exchanger, the throttling device and the outdoor heat exchanger are connected to form a refrigerant circulation loop. The air conditioning system further comprises a first one-way valve and a first switch valve, the air conditioning system has a heating mode, a refrigerant outlet of the indoor heat exchanger in the heating mode communicates with the refrigerant circulation loop through the first one-way valve, and the first one-way valve prevents refrigerant from flowing back to the indoor heat exchanger side in the heating mode. A refrigerant inlet of the indoor heat exchanger in a heating mode is communicated with the refrigerant circulation loop through the first switch valve. According to the utility model, the risk of indoor refrigerant leakage after the air-conditioning system is shut down can be reduced, and the safety of the air-conditioning system is improved.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to an air conditioning system and an air conditioner. Background Technology

[0002] In recent years, scholars both domestically and internationally have been accelerating the replacement of R22 refrigerant. However, due to the advantages and disadvantages of each alternative refrigerant, a specific replacement plan remains unresolved. Among the replacement options for R22 refrigerant, R410A and R290 are considered important choices. As a replacement for R22, R410A is currently widely used in inverter air conditioning products. However, R410A has a high discharge pressure, a high GWP (Global Warming Potential), and is expensive, making it not a perfect substitute for R22 but rather considered a transitional product. Compared to R410A, R290 refrigerant has significant advantages in both refrigeration performance and environmental requirements. R290 possesses excellent thermodynamic properties, is inexpensive, and is compatible with common lubricating oils and mechanical structural materials. It has a zero ODP (Ozone Depletion Potential) and a very low GWP (Globally Depleting Potential), does not require synthesis, and can be easily extracted from petroleum and natural gas without altering the content of hydrocarbons in nature. The fundamental physical properties of R290 refrigerant, very similar to those of R22 refrigerant, provide an ideal solution for its use as a replacement working fluid. While the replacement of existing non-environmentally friendly refrigerants (such as R22 and R410A) with R290 is an inevitable trend, its flammability and explosiveness are currently the biggest obstacle to its large-scale application in refrigeration systems. Improving the safety of R290 air conditioning systems is the primary issue that must be addressed to vigorously promote the application of the environmentally friendly refrigerant R290.

[0003] A refrigeration and air conditioning system is disclosed in the existing related technology, in which a one-way valve and a solenoid valve are connected in series in the refrigerant circulation loop. The solenoid valve is located on the pipeline upstream of the indoor heat exchanger, and the one-way valve is located on the pipeline downstream of the indoor heat exchanger. When the system is stopped at a specific temperature or when the user turns off the system, the solenoid valve closes. Due to the action of the one-way valve, refrigerant can only flow out of the indoor heat exchanger and cannot be replenished, thereby reducing the risk of indoor refrigerant leakage and improving the safety of the air conditioning system.

[0004] While the above-mentioned scheme of combining a check valve with a solenoid valve can reduce the risk of indoor refrigerant leakage after the refrigeration and air conditioning system is turned off or shut down, most existing air conditioning systems have a heating mode. Therefore, how to reduce the risk of indoor refrigerant leakage after the air conditioning system is turned off or shut down in heating mode has become a technical problem that needs to be solved. Utility Model Content

[0005] Therefore, this utility model provides an air conditioning system and an air conditioner, and the main technical problem to be solved is: how to reduce the risk of indoor refrigerant leakage after the air conditioning system is turned off / stopped in heating mode, and improve the safety of the air conditioning system.

[0006] To solve the above problems, this utility model provides an air conditioning system, which includes a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger; the compressor, the indoor heat exchanger, the throttling device, and the outdoor heat exchanger are connected to form a refrigerant circulation loop;

[0007] The air conditioning system further includes a first one-way valve and a first on / off valve. The air conditioning system has a heating mode. In the heating mode, the refrigerant outlet of the indoor heat exchanger is connected to the refrigerant circulation loop through the first one-way valve, and the first one-way valve prevents the refrigerant from flowing back to the indoor heat exchanger side in the heating mode. In the heating mode, the refrigerant inlet of the indoor heat exchanger is connected to the refrigerant circulation loop through the first on / off valve.

[0008] In some embodiments, the air conditioning system further includes a second one-way valve and a second switching valve. The air conditioning system has a cooling mode. In the cooling mode, the refrigerant outlet of the indoor heat exchanger is connected to the refrigerant circulation loop through the second one-way valve, and the second one-way valve prevents refrigerant from flowing back to the indoor heat exchanger side in the cooling mode. In the cooling mode, the refrigerant inlet of the indoor heat exchanger is connected to the refrigerant circulation loop through the second switching valve.

[0009] In some embodiments, the first check valve and the second switching valve are connected in parallel to form a first parallel branch, which is connected in series in the refrigerant circulation loop.

[0010] In some embodiments, the second check valve is connected in parallel with the first switching valve to form a second parallel branch, and the second parallel branch is connected in series in the refrigerant circulation loop.

[0011] In some embodiments, the air conditioning system further includes a four-way valve connected to the refrigerant circulation loop to control the flow direction of the refrigerant in the refrigerant circulation loop, thereby enabling the air conditioning system to operate in heating or cooling mode. Specifically, when the first check valve and the second switching valve are connected in parallel to form a first parallel branch, and this first parallel branch is connected in series in the refrigerant circulation loop to connect the first check valve and the second switching valve to the refrigerant circulation loop, the first parallel branch is connected in series between the throttling device and one end of the indoor heat exchanger; the second parallel branch is connected in series between the four-way valve and the other end of the indoor heat exchanger.

[0012] In some embodiments, the second one-way valve and / or the second switching valve is located on the outdoor side of the air conditioning system.

[0013] In some embodiments, the first one-way valve and / or the first switching valve is located on the outdoor side of the air conditioning system.

[0014] In some embodiments, the air conditioning system further includes a first temperature sensor and a second temperature sensor;

[0015] The first temperature sensor is used to detect the tube wall temperature T1 of the heat exchanger tube of the outdoor heat exchanger; the second temperature sensor is used to detect the outdoor ambient temperature T2.

[0016] In some implementations, the refrigerant in the air conditioning system is R290 refrigerant.

[0017] This utility model also provides an air conditioner, which includes the air conditioning system described in any one of the above descriptions.

[0018] The air conditioning system and air conditioner provided by this utility model have the following beneficial effects:

[0019] 1. When the air conditioning system is running in heating mode, if it stops at the designated temperature or the user turns it off, the first switch valve on the upstream side of the indoor heat exchanger can be closed, disconnecting the flow path on the upstream side of the indoor heat exchanger and preventing refrigerant from flowing into the indoor heat exchanger. Furthermore, due to the action of the first one-way valve on the downstream side of the indoor heat exchanger, the refrigerant can only flow out of the indoor heat exchanger and cannot flow back into it. In this way, the first switch valve and the first one-way valve work together to ensure that after the air conditioning system is turned off / stopped in heating mode, the refrigerant in the indoor heat exchanger can only flow out and cannot be replenished, thereby reducing the risk of indoor refrigerant leakage after the air conditioning system is turned off / stopped in heating mode and improving the safety of the air conditioning system.

[0020] 2. When the air conditioning system is running in cooling mode, if it stops at the designated temperature or the user turns it off, the second switch valve upstream of the indoor heat exchanger can be closed. This disconnects the flow path upstream of the indoor heat exchanger, preventing refrigerant from flowing into it. Furthermore, due to the action of the second check valve downstream of the indoor heat exchanger, the refrigerant can only flow outwards from the indoor heat exchanger and cannot flow back inwards. In this way, the second switch valve and the second check valve work together to ensure that after the air conditioning system is turned off / stopped in cooling mode, the refrigerant in the indoor heat exchanger can only flow outwards and cannot be replenished inwards. This reduces the risk of refrigerant leakage after the air conditioning system is turned off / stopped in cooling mode, thus improving the safety of the air conditioning system.

[0021] 3. Compared to other types of valves, such as on / off valves, the first and second check valves only physically control the refrigerant flow direction, without the need for manual or electronic control. This simplifies the control structure of the entire air conditioning system, making the control structure simpler and saving control costs.

[0022] 4. It is conducive to the promotion and application of environmentally friendly refrigerant R290, enhances brand image, and improves safety. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in one embodiment of the present invention.

[0025] The attached figures are labeled as follows:

[0026] 1. Compressor; 2. Indoor heat exchanger; 3. Throttling device; 4. Outdoor heat exchanger; 5. Four-way valve; 6. First check valve; 7. First switching valve; 8. Second check valve; 9. Second switching valve; 69. First parallel branch; 87. Second parallel branch. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, 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 utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0029] 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.

[0030] 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 cannot be construed as limiting the scope of protection of this utility model.

[0031] 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 indoor heat exchanger 2, a throttling device 3, and an outdoor heat exchanger 4. The compressor 1, indoor heat exchanger 2, throttling device 3, and outdoor heat exchanger 4 are connected to form a refrigerant circulation loop. The air conditioning system also includes a first one-way valve 6 and a first switching valve 7. The air conditioning system has a heating mode. In the heating mode, the refrigerant outlet of the indoor heat exchanger 2 is connected to the refrigerant circulation loop through the first one-way valve 6, and the first one-way valve 6 prevents refrigerant from flowing back to the indoor heat exchanger 2 in the heating mode. In the heating mode, the refrigerant inlet of the indoor heat exchanger 2 is connected to the refrigerant circulation loop through the first switching valve 7.

[0032] In the heating mode, along the flow direction of the refrigerant in the refrigerant circulation loop, the first one-way valve 6 is located downstream of the indoor heat exchanger 2, and the first on / off valve 7 is located upstream of the indoor heat exchanger 2. The first on / off valve 7 is used to control the opening and closing of the flow path upstream of the indoor heat exchanger 2 in the heating mode.

[0033] In the example above, when the air conditioning system is running in heating mode, if it stops at a specific temperature or the user turns it off, the first switching valve 7 upstream of the indoor heat exchanger 2 can be closed, disconnecting the flow path upstream of the indoor heat exchanger 2 and preventing refrigerant from flowing into the indoor heat exchanger 2. Furthermore, due to the action of the first one-way valve 6 downstream of the indoor heat exchanger 2, the refrigerant can only flow outwards from the indoor heat exchanger 2 and cannot flow back inwards. Thus, the first switching valve 7 and the first one-way valve 6 work together to ensure that after the air conditioning system is turned off / stopped in heating mode, the refrigerant in the indoor heat exchanger 2 can only flow outwards and cannot be replenished inwards. This reduces the risk of refrigerant leakage after the air conditioning system is turned off / stopped in heating mode, improving the safety of the air conditioning system.

[0034] In addition, compared with other types of valves such as on / off valves, since the first one-way valve 6 only physically controls the refrigerant flow direction, it does not require manual or electronic control, which simplifies the control structure of the entire air conditioning system, making the control structure of the air conditioning system simpler and saving control costs.

[0035] In some embodiments, the aforementioned first one-way valve 6 can be located on the outdoor side of the air conditioning system, so that the first one-way valve 6 can prevent refrigerant from flowing back to the entire indoor side in heating mode, thereby further reducing the refrigerant content on the indoor side when the air conditioning system is turned off / stopped in heating mode, and thus further reducing the risk of indoor refrigerant leakage.

[0036] The aforementioned first switching valve 7 can also be located on the outdoor side of the air conditioning system. In this way, when the air conditioning system is turned off / stopped in heating mode, the first switching valve 7 can be closed to prevent refrigerant from flowing into the entire indoor side, thereby further reducing the refrigerant content on the indoor side when the air conditioning system is turned off / stopped in heating mode, and thus further reducing the risk of indoor refrigerant leakage.

[0037] In some implementations, such as Figure 1 As shown, the aforementioned air conditioning system may further include a second one-way valve 8 and a second switching valve 9. The air conditioning system has a cooling mode. In cooling mode, the refrigerant outlet of the indoor heat exchanger 2 is connected to the refrigerant circulation loop via the second one-way valve 8, and the second one-way valve 8 prevents refrigerant from flowing back to the indoor heat exchanger 2 in cooling mode. In cooling mode, the refrigerant inlet of the indoor heat exchanger 2 is connected to the refrigerant circulation loop via the second switching valve 9.

[0038] In the cooling mode, along the refrigerant circulation loop, the second check valve 8 is located downstream of the indoor heat exchanger 2, and the second switching valve 9 is located upstream of the indoor heat exchanger 2. The second switching valve 9 is used to control the on / off state of the upstream flow path of the indoor heat exchanger 2 in the cooling mode.

[0039] In the example above, when the air conditioning system is running in cooling mode, if it stops at a specific temperature or the user turns it off, the second switch valve 9 upstream of the indoor heat exchanger 2 can be closed, disconnecting the flow path upstream of the indoor heat exchanger 2 and preventing refrigerant from flowing into the indoor heat exchanger 2. Furthermore, due to the action of the second one-way valve 8 downstream of the indoor heat exchanger 2, the refrigerant can only flow outward from the indoor heat exchanger 2 and cannot flow back inward. Thus, the cooperation of the second switch valve 9 and the second one-way valve 8 ensures that after the air conditioning system is turned off / stopped in cooling mode, the refrigerant in the indoor heat exchanger 2 can only flow outward and cannot be replenished inward, thereby reducing the risk of indoor refrigerant leakage after the air conditioning system is turned off / stopped in cooling mode and improving the safety of the air conditioning system.

[0040] In addition, compared with other types of valves such as on / off valves, since the second check valve 9 only physically controls the refrigerant flow direction, it does not require manual or electronic control, which simplifies the control structure of the entire air conditioning system, making the control structure of the air conditioning system simpler and saving control costs.

[0041] Among them, the first switching valve 7, the second switching valve 9, the first one-way valve 6, and the second one-way valve 8 work together so that when the system stops at the temperature point or the user turns off the system, regardless of whether the air conditioning system is cooling or heating, the refrigerant in the indoor heat exchanger 2 can only go out because of the one-way valve, and cannot be replenished inside. This can reduce the risk of indoor refrigerant leakage and improve the safety of the air conditioning system.

[0042] It should be noted that the refrigerant inlet and refrigerant outlet of the aforementioned indoor heat exchanger 2 are interchanged in heating mode and cooling mode. That is, the refrigerant inlet of the indoor heat exchanger 2 in heating mode is the refrigerant outlet of the indoor heat exchanger 2 in cooling mode, and the refrigerant outlet of the indoor heat exchanger 2 in heating mode is the refrigerant inlet of the indoor heat exchanger 2 in cooling mode.

[0043] In some embodiments, the aforementioned second one-way valve 8 can be located on the outdoor side of the air conditioning system, so that the second one-way valve 8 can prevent refrigerant from flowing back to the entire indoor side in cooling mode, thereby further reducing the refrigerant content on the indoor side when the air conditioning system is turned off / stopped, and thus further reducing the risk of indoor refrigerant leakage.

[0044] The aforementioned second switch valve 9 can also be located on the outdoor side of the air conditioning system. In this way, when the air conditioning system is turned off / stopped in cooling mode, the second switch valve 9 will be closed to prevent refrigerant from flowing into the entire indoor side, thereby further reducing the refrigerant content on the indoor side when the air conditioning system is turned off / stopped in cooling mode, and thus further reducing the risk of indoor refrigerant leakage.

[0045] In some implementations, such as Figure 1As shown, the aforementioned first check valve 6 and second switching valve 9 are connected in parallel to form a first parallel branch 69. This first parallel branch 69 is connected in series in the refrigerant circulation loop to achieve the purpose of connecting the refrigerant outlet of the indoor heat exchanger 2 in heating mode to the refrigerant circulation loop through the first check valve 6, and to achieve the purpose of connecting the refrigerant inlet of the indoor heat exchanger 2 in cooling mode to the refrigerant circulation loop through the second switching valve 9.

[0046] Because the refrigerant flows in opposite directions during cooling and heating in an air conditioning system, in the example above, by connecting the first parallel branch 69, formed by the first one-way valve 6 and the second switching valve 9 in parallel, in series with the refrigerant circulation loop, it is possible to achieve the purpose of the first one-way valve 6 being located downstream of the indoor heat exchanger 2 during heating, and the second switching valve 9 being located upstream of the indoor heat exchanger 2 during cooling.

[0047] In some implementations, such as Figure 1 As shown, the aforementioned second check valve 8 and the first switching valve 7 are connected in parallel to form a second parallel branch 87. The second parallel branch 87 is connected in series in the refrigerant circulation loop so as to realize that the refrigerant inlet of the indoor heat exchanger 2 in the heating mode is connected to the refrigerant circulation loop through the first switching valve 7, and to realize that the refrigerant outlet of the indoor heat exchanger 2 in the cooling mode is connected to the refrigerant circulation loop through the second check valve 8.

[0048] Because the refrigerant flows in opposite directions during cooling and heating in an air conditioning system, in the example above, by connecting the second parallel branch 87, formed by the second one-way valve 8 and the first switching valve 7 in parallel, in series with the refrigerant circulation loop, it is possible to achieve the purpose of the second one-way valve 8 being located downstream of the indoor heat exchanger 2 during cooling, and the first switching valve 7 being located upstream of the indoor heat exchanger 2 during heating.

[0049] In some implementations, such as Figure 1 As shown, the aforementioned air conditioning system also includes a four-way valve 5, which is connected to the refrigerant circulation loop to control the flow direction of the refrigerant within the loop, thus enabling the air conditioning system to operate in heating or cooling mode. Specifically, the first parallel branch 69 is connected in series between the throttling device 3 and one end of the indoor heat exchanger 2; the second parallel branch 87 is connected in series between the four-way valve 5 and the other end of the indoor heat exchanger 2.

[0050] In the above example, by connecting the first parallel branch 69 and the second parallel branch 87 in series on both sides of the indoor heat exchanger 2, it is possible to achieve the following: the first check valve 6 is located downstream of the indoor heat exchanger 2 when heating, the second switch valve 9 is located upstream of the indoor heat exchanger 2 when cooling, the second check valve 8 is located downstream of the indoor heat exchanger 2 when cooling, and the first switch valve 7 is located upstream of the indoor heat exchanger 2 when heating.

[0051] In some embodiments, the aforementioned air conditioning system further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is used to detect the tube wall temperature T1 of the heat exchange tube of the outdoor heat exchanger 4; the second temperature sensor is used to detect the outdoor ambient temperature T2.

[0052] In the example above, the operating time of compressor 1 after the air conditioning system is turned off / stopped can be controlled according to the difference between |T1-T2|, so as to facilitate the recovery of all refrigerant on the indoor side of the air conditioning system to the outdoor side and reduce the leakage of refrigerant on the indoor side.

[0053] In a specific application example, the air conditioning system may include a controller that controls the compressor 1 to stop running when |T1-T2|=0-1℃ after the air conditioning system is turned off / stopped, so as to end the refrigerant recovery of the air conditioning system.

[0054] Of course, in another example, the operating time t of compressor 1 after the air conditioning system is turned off / stopped can also be preset. t can be 1s-180s, preferably 10s. That is, the air conditioning system stops operating after compressor 1 has been running for time t after being turned off / stopped. In this other example, the controller is used to control compressor 1 to stop operating after time t after the air conditioning system is turned off / stopped, so as to end the refrigerant recovery of the air conditioning system.

[0055] In some implementations, the refrigerant in the aforementioned air conditioning system can be R290 refrigerant. Of course, the refrigerant in the air conditioning system can also be other types of refrigerant.

[0056] Both the first switching valve 7 and the second switching valve 9 mentioned above can be solenoid valves, which are controlled to open and close by the main board controller of the air conditioner. The solenoid valves can be normally closed solenoid valves, opening when energized and closing when de-energized.

[0057] The aforementioned throttling device 3 can be a throttling valve, such as an electronic expansion valve.

[0058] This utility model also provides an air conditioner that may include any of the air conditioning systems described above. Because the air conditioner uses the aforementioned air conditioning system, when the air conditioning system is running in heating mode, if the system stops at a set temperature or the user turns it off, the first switching valve 7 upstream of the indoor heat exchanger 2 can be closed, disconnecting the flow path upstream of the indoor heat exchanger 2 and preventing refrigerant from flowing to the indoor heat exchanger 2. Furthermore, due to the action of the first one-way valve 6 downstream of the indoor heat exchanger 2, the refrigerant can only flow out of the indoor heat exchanger 2 and cannot flow back into it. Thus, the first switching valve 7 and the first one-way valve 6 work together to ensure that after the air conditioning system is turned off / stopped in heating mode, the refrigerant in the indoor heat exchanger 2 can only flow out and cannot be replenished, thereby reducing the risk of refrigerant leakage after the air conditioning system is turned off / stopped in heating mode and improving the safety of the air conditioning system. Additionally, it facilitates the promotion and application of the environmentally friendly refrigerant R290, enhances brand image, and provides safety assurance.

[0059] For ease of understanding, the overall structure of this utility model will be described below, and its working principle will be explained.

[0060] 1. Air conditioning system cooling operation.

[0061] When the air conditioning system is in cooling mode, the first switch valve 7 is closed and the second switch valve 9 is open, and the compressor 1 runs. The second switch valve 9 can be a solenoid valve. When the solenoid valve is energized and opened, it is a normally closed solenoid valve and remains open when not energized.

[0062] When the air conditioning system is in cooling mode, the refrigerant flow path is as follows: compressor 1 - four-way valve 5 - outdoor heat exchanger 4 - throttling device 3 - second switching valve 9 (first one-way valve 6 cannot pass through) - indoor heat exchanger 2 - second one-way valve 8 (first switching valve 7 is closed) - four-way valve 5 - compressor 1, completing the entire cycle.

[0063] When the system stops at the designated temperature or is turned off by the user, the second switch valve 9 closes. After a time t, compressor 1 stops and resumes operation. Time t can be 1-180 seconds; here, 10 seconds is used. The continuous operation of compressor 1 during this time t is for refrigerant recovery, that is, drawing refrigerant from the indoor side to the outdoor side. The longer the time t, the better the refrigerant recovery effect. Generally, the refrigerant recovery time t does not exceed 3 minutes. To avoid excessive refrigerant flashing noise when the air conditioning system restarts due to overly thorough refrigerant recovery (indoor heat exchanger 2 is in a vacuum state; once connected, it is prone to flashing), time t is set to only 10 seconds here.

[0064] At this time, the refrigerant in indoor heat exchanger 2 is in a low temperature and low pressure state, with less refrigerant, lower density, and higher safety.

[0065] 2. The air conditioning system is in heating mode.

[0066] When the air conditioning system is in heating mode, the four-way valve 5 is energized and reversed, the first switching valve 7 opens and the second switching valve 9 closes, and the compressor 1 runs. The first switching valve 7 can be a solenoid valve. After being energized and opened, the solenoid valve is a normally closed solenoid valve and remains open when not energized.

[0067] When the air conditioning system is in heating mode, the refrigerant flow path is as follows: compressor 1 - four-way valve 5 - first switching valve 7 (second one-way valve 8 cannot pass through) - indoor heat exchanger 2 - first one-way valve 6 (second switching valve 9 is closed) - throttling device 3 - outdoor heat exchanger 4 - four-way valve 5 - compressor 1, completing the entire cycle.

[0068] When the system stops at the designated temperature or the user turns it off, the first switching valve 7 closes. After a time t, the compressor 1 stops running. At this time, the refrigerant in the indoor heat exchanger 2 is a high-temperature, high-pressure refrigerant. After the first switching valve 7 closes, due to the action of the first one-way valve 6, the refrigerant in the indoor heat exchanger 2 can only flow out and not in, eventually reaching system pressure balance. However, because the air conditioning system is in heating mode, the indoor temperature is generally higher than the outdoor temperature, and the refrigerant density in the indoor heat exchanger 2 is lower than that outdoors. When balance is finally reached, the refrigerant in the indoor heat exchanger 2 is less than the normally connected refrigerant, so the effect is not as good as in cooling mode, but it does reduce the amount of refrigerant stored in the indoor heat exchanger 2 to some extent. The first switching valve 7 does not open and always acts as an isolation valve. Once indoor refrigerant leaks, the indoor refrigerant content is low, greatly improving safety.

[0069] 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.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. 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 this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An air conditioning system, characterized by: The air conditioner system comprises a compressor (1), an indoor heat exchanger (2), a throttling device (3) and an outdoor heat exchanger (4); the compressor (1), the indoor heat exchanger (2), the throttling device (3) and the outdoor heat exchanger (4) are connected to form a refrigerant circulation loop; The air conditioner system further comprises a first one-way valve (6) and a first switch valve (7), the air conditioner system has a heating mode, the refrigerant outlet of the indoor heat exchanger (2) in the heating mode is communicated on the refrigerant circulation loop through the first one-way valve (6), and the first one-way valve (6) prevents the backflow of refrigerant to the indoor heat exchanger (2) side in the heating mode; the refrigerant inlet of the indoor heat exchanger (2) in the heating mode is communicated on the refrigerant circulation loop through the first switch valve (7).

2. The air conditioner system according to claim 1, wherein: The air conditioner system further comprises a second one-way valve (8) and a second switch valve (9), the air conditioner system has a cooling mode, the refrigerant outlet of the indoor heat exchanger (2) in the cooling mode is communicated on the refrigerant circulation loop through the second one-way valve (8), and the second one-way valve (8) prevents the backflow of refrigerant to the indoor heat exchanger (2) side in the cooling mode; the refrigerant inlet of the indoor heat exchanger (2) in the cooling mode is communicated on the refrigerant circulation loop through the second switch valve (9).

3. The air conditioner system according to claim 2, wherein: The first one-way valve (6) and the second switch valve (9) are connected in parallel to form a first parallel branch (69), and the first parallel branch (69) is connected in series on the refrigerant circulation loop.

4. The air conditioner system according to claim 2 or 3, wherein: The second one-way valve (8) and the first switch valve (7) are connected in parallel to form a second parallel branch (87), and the second parallel branch (87) is connected in series on the refrigerant circulation loop.

5. The air conditioning system of claim 4, wherein: The air conditioner system further comprises a four-way valve (5) connected on the refrigerant circulation loop to control the flow direction of the refrigerant in the refrigerant circulation loop, so that the air conditioner system is in a heating mode or a cooling mode; when the first one-way valve (6) and the second switch valve (9) are connected in parallel to form a first parallel branch (69), and the first parallel branch (69) is connected in series between the throttling device (3) and one end of the indoor heat exchanger (2), the second parallel branch (87) is connected in series between the four-way valve (5) and the other end of the indoor heat exchanger (2).

6. The air conditioner system according to any one of claims 2-3, 5, wherein: The second one-way valve (8) and / or the second switch valve (9) are located on the outdoor side of the air conditioner system.

7. The air conditioner system according to any one of claims 1-3, 5, wherein: The first one-way valve (6) and / or the first switch valve (7) are located on the outdoor side of the air conditioner system.

8. The air conditioning system of any one of claims 1-3, 5, wherein: Further comprising a first temperature sensor and a second temperature sensor; The first temperature sensor is used for detecting the tube wall temperature T1 of the heat exchange tube of the outdoor heat exchanger (4); and the second temperature sensor is used for detecting the outdoor environment temperature T2.

9. The air conditioning system of any one of claims 1-3, 5, wherein: The refrigerant in the air conditioning system is R290 refrigerant.

10. An air conditioner characterized by comprising: The air conditioning system of any one of claims 1-9.

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