A control method of an air conditioning heating system

Abstract

This invention relates to the field of compressors, specifically to an air conditioning heating system and its control method, and an air conditioner. It includes: a compressor, a first heat exchanger, a first throttling device, a second heat exchanger, a second throttling device, a third heat exchanger, a hot water pipe, and a control module; the first heat exchanger is thermally coupled to the hot water pipe, and the second heat exchanger is thermally coupled to the control module; the first throttling device is configured such that when the temperature T of the control module is greater than a first preset temperature t1, and the outlet water temperature t0 of the hot water pipe is greater than a second preset temperature t2, the opening degree of the first throttling device can be reduced to a preset opening degree range so that the temperature of the refrigerant flowing through the first throttling device is within the preset temperature range, so that when both the outlet water temperature and the refrigerant temperature of the hot water pipe in the heating system are high, the temperature of the control module is within a reasonable range.

Description

Technical Field

[0001] This invention relates to the field of compressors, specifically to an air conditioning heating system and its control method, and an air conditioner. Background Technology

[0002] With technological advancements, more and more units are employing liquid cooling to dissipate heat from the drive plate. To prevent condensation damage to the drive plate caused by excessively low cooling pipe temperatures, throttling is necessary in the pipes downstream of the drive module's cooling plate. In heating systems, the required outlet water temperature for modular units is increasingly stringent, currently reaching a maximum of 65°C in the industry. Some projects, aiming to replace boilers and other equipment, have even demanded 70°C or higher water temperatures. As the water temperature rises, the refrigerant's saturation temperature also increases accordingly, typically about 3°C ​​higher than the water temperature. For example, with a 65°C outlet water temperature, the refrigerant saturation temperature reaches 68°C, while the normal operating temperature of the drive module does not exceed 90°C. The temperature difference between the refrigerant and the drive module's maximum operating temperature decreases, resulting in a smaller heat exchange temperature difference. Consequently, the refrigerant's cooling effect on the drive module is very limited. Without specific control strategies, the entire unit is prone to triggering drive module temperature protection, leading to unit shutdown.

[0003] Patent CN114777352A discloses a heat pump system, including a compressor, a four-way valve, a first heat exchanger, a throttling device, and a second heat exchanger connected by a refrigerant circulation pipeline, as well as a one-way valve assembly. It utilizes low-temperature liquid refrigerant to exchange heat and cool the compressor's drive module. A third electronic expansion valve controls the bypass flow of the refrigerant, thereby controlling the refrigerant flow that exchanges heat with the drive heat dissipation module. This ensures precise and sufficient heat dissipation from the drive heat dissipation module, preventing damage caused by condensation. During the refrigeration cycle, the temperature sensing bulb for the cooling pipeline is located at the outlet of the cooling plate pipeline, focusing more on heat dissipation control during the cooling mode.

[0004] For heating systems, there is currently no good solution for keeping the temperature of the control module within a reasonable range when both the outlet water temperature and the refrigerant temperature in the hot water pipe are high. Summary of the Invention

[0005] In order to keep the temperature of the control module within a reasonable range when the outlet water temperature and refrigerant temperature of the hot water pipe in the heating system are both high, an air conditioning heating system and its control method, as well as an air conditioner, are proposed.

[0006] The present invention provides an air conditioning heating system, comprising: a compressor, a first heat exchanger, a first throttling device, a second heat exchanger, a second throttling device, a third heat exchanger, a hot water pipeline, and a control module; refrigerant discharged from the outlet of the compressor flows sequentially through the refrigerant pipeline into the first heat exchanger, the first throttling device, the second heat exchanger, the second throttling device, and the third heat exchanger, and then flows back to the inlet of the compressor;

[0007] The first heat exchanger is thermally coupled to the hot water pipeline, and the second heat exchanger is thermally coupled to the control module;

[0008] The first throttling device is configured such that when the temperature T of the control module is greater than the first preset temperature t1 and the outlet water temperature t0 of the hot water pipe is greater than the second preset temperature t2, the opening degree of the first throttling device can be reduced to a preset opening degree range so that the temperature of the refrigerant flowing through the first throttling device is within the preset temperature range.

[0009] Preferably, the air conditioning heating system further includes a water pump, and the hot water pipeline is a circulation pipeline, with the water pump connected in series on the circulation pipeline.

[0010] On the other hand, the present invention also proposes a control method for an air conditioning heating system, which is used in the air conditioning heating system. The control method for the air conditioning heating system is as follows: according to the temperature T of the control module and the outlet water temperature t0 of the hot water pipe, the opening degree of the first throttling device and the second throttling device are controlled, and the operating frequency of the compressor is controlled.

[0011] Preferably, the control method for the air conditioning heating system includes multiple control modes;

[0012] When T is less than the first preset temperature t1, the first control mode is executed. The first control mode is: the first throttling device is kept at its maximum opening, the second throttling device is kept at its preset opening, and the compressor operating frequency remains unchanged.

[0013] When T is greater than or equal to the first preset temperature t1 and t0 is less than the second preset temperature t2, the second control mode is executed. The second control mode is: to keep the opening of the first throttling device at its maximum, to keep the second throttling device at its preset opening, and to reduce the operating frequency of the compressor.

[0014] When T is greater than or equal to the first preset temperature t1, and t0 is greater than the second preset temperature t2, the third control mode is executed. The third control mode is: reduce the opening of the first throttling device, increase the opening of the second throttling device, and keep the compressor operating frequency unchanged; t1 < t2.

[0015] Preferably, the second control mode further includes increasing the operating power of the water pump.

[0016] Preferably, the third control mode further includes: increasing the operating power of the water pump.

[0017] Preferably, the third control mode further includes: the minimum opening degree of the first throttling device is greater than or equal to α.

[0018] Preferably, the multiple control modes also include a fourth control mode. When T is less than the third preset temperature t3, the fourth control mode is executed. The fourth control mode is: increasing the opening of the first throttling device and / or increasing the operating frequency of the compressor; t3 < t1.

[0019] Preferably, the fourth control mode further includes: reducing the operating power of the water pump.

[0020] The present invention also proposes an air conditioner, including an air conditioning heating system.

[0021] Thirdly, the present invention also proposes an air conditioner, including an air conditioning heating system.

[0022] When both the outlet water temperature of the hot water pipe and the temperature of the control module are high, the present invention adjusts the opening of the first throttle valve to a preset opening range, thereby ensuring that the temperature of the control module is within a reasonable range and that the heating effect of the hot water pipe is guaranteed. Attached Figure Description

[0023] To more clearly illustrate the embodiments of the present invention 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. Obviously, 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] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0025] Figure 1 This is a diagram of the heating system according to an embodiment of the present invention;

[0026] Figure 2 This is a flowchart of the control method according to an embodiment of the present invention.

[0027] The reference numerals in the attached figures are as follows:

[0028] 1. Compressor; 101. Water pump; 201. First heat exchanger; 202. Second heat exchanger; 203. Third heat exchanger; 301. First throttling device; 302. Second throttling device; 4. Hot water pipeline; 5. Control module; 601. First temperature sensing element; 602. Second temperature sensing element; 603. Third temperature sensing element; 604. Fourth temperature sensing element; 7. Four-way valve; 8. Gas-liquid separator; 901. First filter; 902. Second filter. Detailed Implementation

[0029] 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.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0031] Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof; the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that an item or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such item or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the item or system that includes that element.

[0032] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] 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.

[0035] 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.

[0036] 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, and does not imply any sequential order; 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.

[0037] This invention relates to the field of compressors, specifically to an air conditioning heating system and its control method, and an air conditioner.

[0038] With technological advancements, more and more units are employing liquid cooling to dissipate heat from the drive plate. To prevent condensation damage to the drive plate caused by excessively low cooling pipe temperatures, throttling is necessary in the pipes downstream of the drive module's cooling plate. In heating systems, the required outlet water temperature for modular units is increasingly stringent, currently reaching a maximum of 65°C in the industry. Some projects, aiming to replace boilers and other equipment, have even demanded 70°C or higher water temperatures. As the water temperature rises, the refrigerant's saturation temperature also increases accordingly, typically about 3°C ​​higher than the water temperature. For example, with a 65°C outlet water temperature, the refrigerant saturation temperature reaches 68°C, while the normal operating temperature of the drive module does not exceed 90°C. The temperature difference between the refrigerant and the drive module's maximum operating temperature decreases, resulting in a smaller heat exchange temperature difference. Consequently, the refrigerant's cooling effect on the drive module is very limited. Without specific control strategies, the entire unit is prone to triggering drive module temperature protection, leading to unit shutdown.

[0039] Patent CN114777352A discloses a heat pump system, including a compressor, a four-way valve, a first heat exchanger, a throttling device, and a second heat exchanger connected by a refrigerant circulation pipeline, as well as a one-way valve assembly. It utilizes low-temperature liquid refrigerant to exchange heat and cool the compressor's drive module. A third electronic expansion valve controls the bypass flow of the refrigerant, thereby controlling the refrigerant flow that exchanges heat with the drive heat dissipation module. This ensures precise and sufficient heat dissipation from the drive heat dissipation module, preventing damage caused by condensation. During the refrigeration cycle, the temperature sensing bulb for the cooling pipeline is located at the outlet of the cooling plate pipeline, focusing more on heat dissipation control during the cooling mode.

[0040] In order to keep the temperature of the control module within a reasonable range when the outlet water temperature and refrigerant temperature of the hot water pipe in the heating system are both high, an air conditioning heating system and its control method, as well as an air conditioner, are proposed.

[0041] Firstly, an air conditioning heating system, such as Figure 1-2 As shown, it includes: compressor 1, first heat exchanger 201, first throttling device 301, second heat exchanger 202, second throttling device 302, third heat exchanger 203, hot water pipeline 4, and control module 5; the refrigerant discharged from the outlet of compressor 1 flows sequentially through the refrigerant pipeline into the first heat exchanger 201, the first throttling device 301, the second heat exchanger 202, the second throttling device 302, and the third heat exchanger 203, and then flows back to the inlet of compressor 1;

[0042] The first heat exchanger 201 is thermally coupled to the hot water pipe 4, and the second heat exchanger 202 is thermally coupled to the control module 5.

[0043] The first throttling device 301 is configured such that when the temperature T of the control module 5 is greater than the first preset temperature t1 and the outlet water temperature t0 of the hot water pipe 4 is greater than the second preset temperature t2, the opening degree of the first throttling device 301 can be reduced to a preset opening degree range so that the temperature of the refrigerant flowing through the first throttling device 301 is within the preset temperature range.

[0044] When the temperature T of the control module 5 is greater than the first preset temperature t1 and the outlet water temperature t0 of the hot water pipe 4 is greater than the second preset temperature t2, it indicates that the temperature of the refrigerant is too high when it passes through the second heat exchanger 202, and the cooling effect of the second heat exchanger 202 on the control module 5 is poor. At this time, the opening degree of the first throttling device 301 is set within the preset opening degree range, thereby reducing the temperature of the refrigerant after flowing through the second heat exchanger 202 to the preset temperature range, so that the temperature difference between the refrigerant and the control module 5 is within a reasonable range, preventing the temperature difference from being too high and causing insufficient cooling effect of the refrigerant on the control module 5. That is, the refrigerant can effectively cool the control module 5 while avoiding condensation in the control module 5, ensuring that the control module 5 is within a reasonable temperature range.

[0045] By adjusting the first throttling device 301, the control module 5 can be cooled down, while the hot water pipe 4 can be heated normally.

[0046] In this application, "thermal coupling" refers to a connection capable of heat exchange. Compressor 1 is a variable frequency compressor.

[0047] The direct cause of the temperature rise in control module 5 is that the operating frequency of compressor 1 is too high; that is, without the influence of other factors, as long as the operating frequency of compressor 1 increases, the temperature of control module 5 will inevitably rise, and if the operating frequency of compressor 1 decreases, the temperature of control module 5 will inevitably decrease.

[0048] In this application, a first throttling device 301 is provided between the control module 5 and the first heat exchanger 201 in the air conditioning heating system. After the refrigerant heats the water in the hot water pipe 4, the temperature of the refrigerant flowing through the second heat exchanger 202 is adjusted by adjusting the opening of the first throttling device 301, thereby ensuring that the temperature of the control module 5 is within a suitable range so that the temperature of the refrigerant after flowing through the first throttling device 301 is within the preset temperature range.

[0049] A second throttling device 302 is installed between the control module 5 and the third heat exchanger 203. This causes the refrigerant temperature to decrease after passing through the second throttling device 302 and to increase after absorbing heat from the outside through the third heat exchanger 203. This ensures the temperature of the refrigerant entering the compressor 1 and guarantees the stable operation of the compressor 1. The normal operation of the compressor 1 ensures that the temperature of the refrigerant discharged from the compressor 1 is within a reasonable range, thus ensuring the heating effect of the refrigerant on the hot water pipe 4.

[0050] The cooperation of the first throttling device 301 and the second throttling device 302 ensures that the hot water pipe 4 is heated. While the compressor 1 is working normally and stably, the temperature of the control module 5 is adjusted, and the stability of the air conditioning heating system is ultimately guaranteed.

[0051] To detect the required temperature, a first temperature sensing element 601 can be installed at the outlet pipe of the hot water pipe 4 to detect the outlet water temperature of the hot water pipe 4; a second temperature sensing element 602 can be installed at the control module 5 to detect the control module 5; a third temperature sensing element 603 can be installed on the cooling pipe downstream of the control module 5 to detect the temperature of the refrigerant after passing through the first throttling device 301; a fourth temperature sensing element 604 can be installed near the third heat exchanger 203 to detect the outdoor temperature; a four-way valve 7 can be installed at the inlet of the compressor 1 to switch the working mode of the air conditioning heating system; a first filter 901 can be installed before the first throttling device 301 to filter the refrigerant and prevent the first throttling device 301 from becoming clogged; a second filter 902 can be installed before the third heat exchanger 203 to filter the refrigerant in cooling mode to prevent the second throttling device 302 from becoming clogged.

[0052] The first heat exchanger 201 can be configured as a plate heat exchanger, which is generally installed outdoors.

[0053] Preferred, such as Figure 1 As shown, the air conditioning heating system also includes a water pump 101, and the hot water pipe 4 is a circulation pipe, with the water pump 101 connected in series on the circulation pipe.

[0054] Pump 101 is an adjustable-power pump, and the water circulation speed can be changed by adjusting the pump's power. Pump 101 circulates water within the circulation pipe, absorbing heat from the first heat exchanger 201 and releasing heat as it flows through other parts of the system. By controlling the power of pump 101, the water circulation speed is altered. A faster circulation speed results in more heat absorbed from the refrigerant by the water passing through the first heat exchanger 201, meaning more heat is released from the refrigerant into the water, and the refrigerant temperature flowing through the second heat exchanger 202 is lower. Conversely, a slower circulation speed results in less heat absorbed from the refrigerant by the water passing through the first heat exchanger 201, meaning less heat is released from the refrigerant into the water, and the refrigerant temperature flowing through the second heat exchanger 202 is higher. Thus, by adjusting the power of pump 101, the temperature of the refrigerant flowing through the second heat exchanger 202 is changed, thereby altering the temperature of control module 5.

[0055] The reason why the faster the water circulation speed, the more heat the water absorbs from the refrigerant when passing through the first heat exchanger 201 is that after the water absorbs heat from the refrigerant and heats up at the first heat exchanger 201, it flows at a relatively fast speed to a space with a relatively lower temperature and then releases heat outward. The faster the water flows, the shorter the time for this heat absorption and release process, and the more heat the water absorbs from the refrigerant within a certain time. Similarly, the slower the water circulation speed, the less heat the water absorbs from the refrigerant when passing through the first heat exchanger 201.

[0056] Generally, in spaces with lower temperatures, such as indoor spaces, the circulation pipes are mainly laid indoors as indoor heating pipes.

[0057] On the other hand, the present invention also proposes a control method for an air conditioning heating system, used in an air conditioning heating system; such as Figure 2 As shown, the control method of the air conditioning heating system is as follows: based on the temperature T of the control module 5 and the outlet water temperature t0 of the hot water pipe 4, the opening degree of the first throttling device 301 and the second throttling device 302 are controlled to control the operating frequency of the compressor 1.

[0058] "The outlet temperature of hot water pipe 4" refers to the temperature of the water after it has absorbed heat through the first heat exchanger 201.

[0059] By detecting the temperature T of the control module 5 and the outlet water temperature t0 of the hot water pipe 4, the cause of the abnormal temperature of the control module 5 can be determined more accurately. Then, based on the cause of the abnormal temperature of the control module 5, the opening degree of the first throttling device 301 and the second throttling device 302 can be controlled to control the operating frequency of the compressor 1, so as to ensure that the control module 5 is within a suitable temperature range and to ensure the heating effect of the circulation pipe as much as possible.

[0060] Preferably, the control method for the air conditioning heating system includes multiple control modes;

[0061] When T is less than the first preset temperature t1, the first control mode is executed. The first control mode is: the first throttling device 301 is kept at its maximum opening, the second throttling device 302 is kept at its preset opening, and the operating frequency of the compressor 1 remains unchanged.

[0062] When T is greater than or equal to the first preset temperature t1 and t0 is less than the second preset temperature t2, the second control mode is executed. The second control mode is to keep the opening of the first throttling device 301 at its maximum, keep the opening of the second throttling device 302 at its preset opening, and reduce the operating frequency of the compressor 1.

[0063] When T is greater than or equal to the first preset temperature t1 and t0 is greater than the second preset temperature t2, the third control mode is executed. The third control mode is: reduce the opening of the first throttling device 301, increase the opening of the second throttling device 302, and keep the operating frequency of compressor 1 unchanged; t1 < t2 ≤ t3.

[0064] The first preset temperature t1 is set based on the highest temperature at which the control module 5 can operate normally. t1 can be the highest temperature at which the control module 5 can operate normally. For safety, a certain safety margin is often set, and t1 is slightly lower than the highest temperature. In this way, even if the control module 5 reaches the highest operating temperature, or just exceeds the highest temperature, the control module 5 will not be damaged immediately. t1 can be set between 80 and 87 degrees Celsius.

[0065] The second preset temperature t2 is set according to the environment in which the air conditioning heating system is located. When the outside temperature is low, t2 is set relatively low, and when the outside temperature is high, t2 is set relatively high. t2 can be set between 58 and 65 degrees Celsius.

[0066] Since temperature T is less than the first preset temperature t1, the temperature of control module 5 is not very high and it can work normally. It executes the first control mode, which is as follows: The first throttling device 301 is kept at its maximum opening. The first throttling device 301 is equivalent to part of the refrigerant pipeline and does not throttle the refrigerant. The refrigerant temperature is the same before and after flowing through the first throttling device 301. When the refrigerant flows through the second heat exchanger 202, it maintains the current state to cool or heat control module 5. The second throttling device 302 is kept at a preset opening. When the refrigerant flows through the second throttling device 302, the temperature... As the temperature decreases, the refrigerant changes from a liquid phase to a low-temperature gas-liquid two-phase state. This low-temperature gas-liquid two-phase refrigerant absorbs heat from the outside and its temperature rises as it flows through the third heat exchanger 203. The heated refrigerant then enters compressor 1 through the inlet. Compressing the refrigerant at a constant operating frequency further heats the gas-liquid two-phase refrigerant, transforming it into a high-temperature liquid phase (at which point the gas phase is minimal). The high-temperature liquid phase refrigerant then flows out of compressor 1 and re-enters the first heat exchanger 201 to heat the hot water pipe 4, and this cycle repeats. A gas-liquid separator 8 can be installed before the inlet of compressor 1 to separate the liquid and gaseous refrigerants, reducing the occurrence of liquid slugging. This effectively ensures the temperature stability of the control module 5. No additional adjustments are made to the first throttling device 301 and the second throttling device 302 to avoid affecting the heating of the hot water pipe 4.

[0067] If T is greater than or equal to the first preset temperature t1, the temperature of control module 5 is high and needs to be cooled down. If t0 is less than the second preset temperature t2, it means that the hot water pipe 4 absorbs less heat from the refrigerant, indicating that the refrigerant temperature is low. The temperature rise of control module 5 is not caused by the refrigerant (not because the refrigerant temperature is too high, resulting in poor cooling effect on control module 5), but because the compressor 1's high operating frequency causes the control module 5 to generate more heat, thus leading to the temperature rise. At this time, the second control mode is executed. The second control mode is: keep the opening of the first throttling device 301 at its maximum to not affect the normal flow of the refrigerant, and keep the second throttling device 302 at its preset opening to ensure the gas-liquid two-phase state of the refrigerant when it passes through the third heat exchanger 203. The compressor 1 operating at a high frequency but with a low refrigerant temperature may be due to refrigerant leakage, pipe blockage, or other reasons causing an abnormality in the air conditioning heating system's operation, although it can still function. In this situation, reducing the operating frequency of compressor 1 not only fundamentally reduces the heat generated by control module 5, thereby lowering its temperature, but also avoids increasing the overall workload of the air conditioning heating system and prevents further escalation of abnormalities. However, this will lower the temperature of the refrigerant discharged from compressor 1, reducing the heating effect on hot water pipe 4. This process involves sacrificing some heating effect on hot water pipe 4 to ensure the overall system's safety, reliability, and stability. The compressor 1 operating frequency should be reduced until the temperature of control module 5 drops to a suitable range, that is, not higher than t1, but also not too low, otherwise condensation may occur in control module 5.

[0068] When T is greater than or equal to the first preset temperature t1, the temperature of control module 5 is high and needs to be cooled down; when t0 is greater than the second preset temperature t2, the water temperature is also high, the refrigerant temperature is also high, the temperature difference between the refrigerant and control module 5 is small, and the cooling effect of the refrigerant on control module 5 is poor. At this time, the third control mode is executed. The third control mode is: reduce the opening of the first throttling device 301. The reduction rate of the opening of the first throttling device 301 can be set to (5~8 steps / second), so that when the refrigerant passes through the first throttling device 301, part of the liquid phase refrigerant becomes gas phase and the temperature decreases. The refrigerant with the lower temperature passes through the second heat exchanger 202 to cool down control module 5; since the refrigerant has partially become gas phase when passing through the first throttling device 301, the pressure increases. Increasing the opening of the second throttling device 302 can avoid the refrigerant pressure of the gas and liquid phases being too high and the temperature being too low after flowing through the second throttling device 302. In this way, the operating frequency of compressor 1 remains unchanged, and compressor 1 can work at a stable frequency, ensuring the stable operation of compressor 1; t1 < t2.

[0069] The opening speed of the first throttling device 301 can be reduced by M steps / second. The value of M can be set manually according to the requirements. When setting, factors such as outdoor temperature and outdoor humidity can be taken into account. When the outdoor humidity is high, the value of M can be set to a smaller value to avoid sudden reduction that could cause the control module 5 to suddenly cool down and condense.

[0070] Preferably, the second control mode also includes increasing the operating power of the water pump 101.

[0071] Since the outlet water temperature of hot water pipe 4 is low, it indicates that the refrigerant temperature is also low. Increasing the operating power of water pump 101 at this time can accelerate the circulation of water within hot water pipe 4, improve heat exchange between hot water pipe 4 and the refrigerant, and increase the heat absorbed by the water from the refrigerant, thus raising the water temperature and improving the user experience. Furthermore, as the water absorbs more heat from the refrigerant, the refrigerant temperature further decreases. The lower-temperature refrigerant can then absorb more heat from the control module 5 via the second heat exchanger 202, further reducing the temperature of the control module 5.

[0072] Preferably, the third control mode also includes: increasing the operating power of the water pump 101.

[0073] By increasing the operating power of the water pump 101, the flow of water in the hot water pipe 4 is accelerated, increasing the amount of heat absorbed by the water from the refrigerant, which helps to lower the temperature of the refrigerant. This, in turn, lowers the temperature of the refrigerant after passing through the first throttling device 301, which helps to cool down the control module 5. Since the temperature of the refrigerant is lowered, the reduction in the opening of the first throttling device 301 can be smaller. That is, the opening of the first throttling device 301 does not need to be too small, which helps to reduce the control of the first throttling device 301 and improves control efficiency.

[0074] Preferably, the third control mode further includes: the minimum opening degree of the first throttling device 301 is greater than or equal to α.

[0075] The unit of α is "step".

[0076] By ensuring the opening degree of the first throttling device 301 is greater than or equal to α, the temperature of the refrigerant flowing through the second heat exchanger 202 is prevented from becoming too low, thus avoiding condensation at the second heat exchanger 202 and effectively ensuring the stable operation of the control module 5. If the opening degree of the first throttling device 301 is too small, the temperature of the refrigerant flowing through it will be too low. When the excessively low-temperature refrigerant flows through the second heat exchanger 202, condensation is easily generated when the high-temperature external air comes into contact with the second heat exchanger 202. Contact with the condensate can cause short circuits and other damage to the control module 5. α is generally greater than or equal to 300 and less than or equal to 350 steps.

[0077] The temperature of the refrigerant after passing through the first throttling device 301 should generally not be lower than (Tw+β), where Tw is the outdoor temperature and β is greater than 3 and less than 5.

[0078] Preferably, the multiple control modes also include a fourth control mode. When T is less than the third preset temperature t3, the fourth control mode is executed. The fourth control mode is: increasing the opening of the first throttling device 301 and / or increasing the operating frequency of the compressor 1; t3 < t1.

[0079] When the temperature T of the control module 5 is less than t3, moisture in the outside air may condense when it comes into contact with the control module 5, which will have an adverse effect on the control module 5.

[0080] This situation generally occurs in two scenarios. One is when the third control mode is executed, the opening of the first throttling device 301 is too small, or the continuous reduction in the temperature of the control module 5 leads to excessively low temperatures. In this case, increasing the opening of the first throttling device 301 prevents the control module 5 from becoming too cold. The other scenario is when the ambient temperature of the air conditioning heating system is low, such as when the outdoor temperature is low. When the air conditioning heating system is first started, the temperature of the control module 5 is relatively low. In this case, the opening of the first throttling device 301 is at its maximum, which can increase the operating frequency of the compressor 1, accelerate the rise in the refrigerant temperature, and thus raise the temperature of the control module 5, preventing condensation from forming in the control module 5.

[0081] The opening speed of the first throttling device 301 increases at a rate of N steps / second, which can be set as needed.

[0082] Preferably, the fourth control mode also includes: reducing the operating power of the water pump 101.

[0083] The refrigerant is needed to heat up the control module 5. At this time, the power of the water pump 101 is reduced, thereby reducing the heat absorbed by the water from the refrigerant, which helps to accelerate the heating of the refrigerant and thus accelerates the temperature rise of the control module 5.

[0084] The four control modes of this invention are both independent and interconnected. The following embodiments will be used as examples for illustration:

[0085] Implementation 1: When the outdoor temperature Tw < t1, the air conditioning heating system starts working. Initially, the temperature of control module 5 is T = Tw < t1, and the first control mode is executed. As the compressor works, the temperature of control module 5 rises to T ≥ t1. If the outlet water temperature t0 < t2, the second control mode is executed. In the second control mode, if the temperature of control module 5 drops to T ≤ t3, the fourth control mode is executed, raising the temperature of control module 5 to t3 < T < t1. If, while executing the fourth control mode, the temperature of control module 5 rises to T > t1, the second control mode is executed again. This process is repeated to ensure that the temperature of the control module is between t2 and t1.

[0086] Example 2: When the outdoor temperature Tw < t1, the air conditioning heating system starts working. Initially, the temperature of control module 5 is T = Tw < t1, and the first control mode is executed. As the compressor works, the temperature of control module 5 rises to T ≥ t1. If the outlet water temperature t0 ≥ t2, the third control mode is executed. In the third control mode, when the temperature of control module 5 drops to T ≤ t3, the fourth control mode is executed, raising the temperature of control module 5 to t2 < T < t1. If the temperature of control module 5 rises to T > t1 while executing the fourth control mode, the third control mode is executed again. This control is performed in this way to ensure that the temperature of control module 5 is t2 < T < t1.

[0087] Example 3: When the outdoor ambient temperature is low, such as in winter, the outdoor temperature Tw < t3, and the temperature of control module 5 is T = t3 < t1. The air conditioning heating system starts working, the compressor operates, and the fourth control mode is executed, raising the temperature of the control module to t2 < T < t1. If, while executing the fourth control mode, the temperature of control module 5 rises to T > t1, the second and / or third control modes are executed, lowering the temperature of control module 5 to t2 < T < t1. This control is performed to ensure that the temperature of control module 5 remains between t2 and t1.

[0088] The present invention also proposes an air conditioner, including an air conditioning heating system.

[0089] The above are merely preferred embodiments of the present invention and are 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 are merely preferred embodiments 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. A control method for an air conditioning heating system, characterized in that, The air conditioning heating system includes a compressor (1), a first heat exchanger (201), a first throttling device (301), a second heat exchanger (202), a second throttling device (302), a third heat exchanger (203), a hot water pipeline (4), and a control module (5); the refrigerant discharged from the outlet of the compressor (1) flows sequentially through the refrigerant pipeline into the first heat exchanger (201), the first throttling device (301), the second heat exchanger (202), the second throttling device (302), and the third heat exchanger (203) before flowing back to the inlet of the compressor (1); The first heat exchanger (201) is thermally coupled to the hot water pipeline (4), and the second heat exchanger (202) is thermally coupled to the control module (5); The first throttling device (301) is configured such that when the temperature T of the control module (5) is greater than the first preset temperature t1 and the outlet water temperature t0 of the hot water pipe (4) is greater than the second preset temperature t2, the opening degree of the first throttling device (301) can be reduced to a preset opening degree range so that the temperature of the refrigerant flowing through the first throttling device (301) is within the preset temperature range. The control method of the air conditioning heating system is as follows: based on the temperature T of the control module (5) and the outlet water temperature t0 of the hot water pipe (4), the opening degree of the first throttling device (301) and the second throttling device (302) is controlled, and the operating frequency of the compressor (1) is controlled. When T is greater than or equal to the first preset temperature t1 and t0 is less than the second preset temperature t2, the second control mode is executed. The second control mode is: keep the opening of the first throttling device (301) at the maximum, keep the second throttling device (302) at the preset opening, and reduce the operating frequency of the compressor (1) so that the temperature of the control module (5) is not higher than t1; t1 < t2.

2. The control method for an air conditioning heating system according to claim 1, characterized in that, The control methods for air conditioning heating systems include various control modes; When T is less than the first preset temperature t1, the first control mode is executed. The first control mode is: the opening of the first throttling device (301) is kept at the maximum, the opening of the second throttling device (302) is kept at the preset opening, and the operating frequency of the compressor (1) remains unchanged. When T is greater than or equal to the first preset temperature t1 and t0 is greater than the second preset temperature t2, the third control mode is executed. The third control mode is: reduce the opening of the first throttling device (301), increase the opening of the second throttling device (302), and keep the operating frequency of the compressor (1) unchanged.

3. The control method for the air conditioning heating system according to claim 2, characterized in that, The air conditioning heating system also includes a water pump (101), the hot water pipe (4) is a circulation pipe, and the water pump (101) is connected in series in the circulation pipe; The second control mode also includes increasing the operating power of the water pump (101).

4. The control method for the air conditioning heating system according to claim 3, characterized in that, The third control mode also includes increasing the operating power of the water pump (101).

5. The control method for an air conditioning heating system according to claim 2, characterized in that, The third control mode further includes: the minimum opening degree of the first throttling device (301) is greater than or equal to α.

6. The control method for an air conditioning heating system according to claim 3, characterized in that, The multiple control modes also include a fourth control mode. When T is less than the third preset temperature t3, the fourth control mode is executed. The fourth control mode is: increasing the opening of the first throttling device (301) and / or increasing the operating frequency of the compressor (1). t3 < t1.

7. The control method for an air conditioning heating system according to claim 6, characterized in that, The fourth control mode also includes reducing the operating power of the water pump (101).

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