Unit, unit control method, control device, air conditioning apparatus, and storage medium

Abstract

The application discloses a unit, a unit control method, a control device, air conditioning equipment and a storage medium. The unit comprises an electronic expansion valve, a refrigerant heat dissipation module and a second valve. The electronic expansion valve is arranged on a main pipeline between an indoor heat exchanger and an outdoor heat exchanger. The refrigerant heat dissipation module is arranged on the main pipeline between the outdoor heat exchanger and the electronic expansion valve. The second valve is arranged on a branch pipeline. The starting point of the branch pipeline is located between the refrigerant heat dissipation module and the outdoor heat exchanger. The ending point of the branch pipeline is located between the electronic expansion valve and the refrigerant heat dissipation module. The refrigerant heat dissipation module is additionally arranged on the main pipeline of the unit. The electronic expansion valve is arranged before the refrigerant passes through the refrigerant heat dissipation module. The refrigerant heat dissipation module is equivalent to being incorporated into the outdoor heat exchanger. The outdoor heat exchange area is increased. The low-temperature heating capacity is increased. The branch pipeline is additionally arranged on the main pipeline. The refrigerant after heat absorption is mixed with the refrigerant after throttling. The electronic expansion valve maintains a high throttling strength. The condensation of the refrigerant heat dissipation module is flexibly relieved or avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to a unit, a unit control method, a control device, an air conditioning equipment and a storage medium. BACKGROUND

[0002] Under low-temperature working conditions, because the outdoor ambient temperature is low, the temperature difference between the inside and outside of the outdoor heat exchanger is small, which affects the low-temperature heating capacity. In severe cases, the outdoor heat exchanger is also prone to frosting, which greatly reduces the low-temperature heating capacity and is not conducive to user comfort.

[0003] Currently, the common solutions to improve the low-temperature heating capacity and avoid frosting of the outdoor heat exchanger mainly include adding electric heating and air supplementing and enthalpy increasing on the outdoor side. However, both of the above solutions need to add expensive equipment, which is not conducive to popularization.

[0004] Currently, there is no effective solution to effectively solve the problem of frosting of the outdoor heat exchanger and improve the low-temperature heating capacity of the unit in the prior art. SUMMARY

[0005] The unit, the unit control method, the control device, the air conditioning equipment and the storage medium provided in the embodiments of the present application solve the problem of how to effectively solve the frosting of the outdoor heat exchanger and improve the low-temperature heating capacity of the unit in the prior art.

[0006] To solve the above technical problems, the present application provides a unit, wherein the unit comprises: an electronic expansion valve arranged on a main pipeline between an indoor heat exchanger and an outdoor heat exchanger; a refrigerant heat dissipation module arranged on the main pipeline between the outdoor heat exchanger and the electronic expansion valve; and a second valve arranged on a branch pipeline, wherein the starting point of the branch pipeline is located between the refrigerant heat dissipation module and the outdoor heat exchanger, and the ending point of the branch pipeline is located between the electronic expansion valve and the refrigerant heat dissipation module.

[0007] Further, the unit further comprises: a one-way valve arranged on the branch pipeline and located between the second valve and the ending point of the branch pipeline, for controlling the flow direction of the refrigerant to be from the starting point to the ending point of the branch pipeline.

[0008] Further, the unit further comprises: a first temperature sensing bag arranged at the refrigerant inlet of the refrigerant heat dissipation module, for detecting the refrigerant temperature; and a second temperature sensing bag arranged at the suction pipe of the compressor, for detecting the suction temperature.

[0009] The application further provides a unit control method applied to the unit, wherein the method comprises: after the unit starts heating operation, controlling the electronic expansion valve and the second valve of the branch to be opened; detecting whether the refrigerant heat dissipation module has a condensation risk, and if yes, adjusting the step number of the electronic expansion valve; detecting whether the outdoor heat exchanger has a frost risk; and if yes, closing the second valve and adjusting the step number of the electronic expansion valve.

[0010] Further, the control of the electronic expansion valve and the second valve of the branch to be opened comprises: controlling the electronic expansion valve to be opened at a preset step number; and controlling the second valve to be opened to open the branch.

[0011] Further, the detection of whether the refrigerant heat dissipation module has a condensation risk comprises: determining the refrigerant temperature at the inlet of the refrigerant heat dissipation module by the first temperature sensing bag; judging whether the refrigerant temperature is less than or equal to a first preset temperature; and if yes, determining that the refrigerant heat dissipation module has a condensation risk.

[0012] Further, if yes, the adjustment of the step number of the electronic expansion valve comprises: if it is determined that the refrigerant heat dissipation module has a condensation risk, increasing the step number of the electronic expansion valve; and after a preset time interval, re-detecting whether the refrigerant heat dissipation module has a condensation risk.

[0013] Further, after the detection of whether the refrigerant heat dissipation module has a condensation risk, the method further comprises: if the refrigerant heat dissipation module does not have a condensation risk, keeping the step number of the electronic expansion valve unchanged.

[0014] Further, the detection of whether the outdoor heat exchanger has a frost risk comprises: determining the suction temperature by the second temperature sensing bag; judging whether the suction temperature is less than or equal to a second preset temperature; and if yes, determining that the outdoor heat exchanger has a frost risk.

[0015] Further, if yes, the closing of the second valve and the adjustment of the step number of the electronic expansion valve comprises: if yes, closing the second valve to close the branch; increasing the step number of the electronic expansion valve; and after a preset time interval, re-detecting whether the outdoor heat exchanger has a frost risk.

[0016] Further, after the detection of whether the outdoor heat exchanger has a frost risk, the method further comprises: if the outdoor heat exchanger does not have a frost risk, decreasing the step number of the electronic expansion valve and keeping the opening state of the second valve.

[0017] The application further provides a unit control device for implementing the unit control method, wherein the device comprises: a control module, configured to control the electronic expansion valve and the second valve of the branch to be opened after the unit starts heating operation; a first adjustment module, configured to detect whether the refrigerant heat dissipation module has a condensation risk, and if yes, adjust the step number of the electronic expansion valve; and a second adjustment module, configured to detect whether the outdoor heat exchanger has a frost risk, and if yes, close the second valve and adjust the step number of the electronic expansion valve.

[0018] The application further provides an air conditioning equipment, wherein the air conditioning equipment comprises the unit control device.

[0019] The application further provides a computer readable storage medium, which stores a computer program, wherein the program is executed by a processor to implement the method.

[0020] According to the technical scheme of the application, the refrigerant heat dissipation module is additionally arranged on the main pipeline of the unit, the electronic expansion valve is arranged before the refrigerant flows through the refrigerant heat dissipation module, the refrigerant heat dissipation module is equivalent to being integrated into the outdoor heat exchanger, and the two perform evaporation and heat absorption together, the refrigerant flows through the refrigerant heat dissipation module after throttling by the electronic expansion valve, the outdoor heat exchange area is increased, and the low-temperature heating capacity is increased. In addition, the branch pipeline is additionally arranged on the basis of the main pipeline, the refrigerant after heat absorption is mixed with the refrigerant after throttling, the temperature of the refrigerant entering the refrigerant heat dissipation system is increased, the throttling strength threshold of condensation is increased, the electronic expansion valve can maintain a high throttling strength, and thus the condensation of the refrigerant heat dissipation module can be flexibly relieved or avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a unit according to an embodiment of the application;

[0022] Figure 2 is a flowchart of a unit control method according to an embodiment of the application;

[0023] Figure 3 is a flowchart of unit control logic according to an embodiment of the application;

[0024] Figure 4 is a detailed flowchart of unit control logic according to an embodiment of the application;

[0025] Figure 5 is a structural block diagram of a unit control device according to an embodiment of the application;

[0026] REFERENCE SIGNS:

[0027] Electronic expansion valve 1, indoor heat exchanger 2, outdoor heat exchanger 3, main pipeline 4, refrigerant heat dissipation module 5, second valve 6, branch pipeline 7, first temperature sensing bulb 8, one-way valve 9, second temperature sensing bulb 10, compressor 11, four-way valve 12. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0030] It should be understood that the term "and / or" used herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0031] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted as "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0032] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a product or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such product or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of another identical element in the product or device including the element.

[0033] The optional embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] To solve the problem of how to effectively solve the frosting of outdoor heat exchanger and improve the low-temperature heating capacity of the unit in the prior art, the embodiment provides a unit. The unit at least comprises an indoor unit, an outdoor unit, an electronic expansion valve for controlling the refrigerant flow of the outdoor heat exchanger, and a temperature sensing bag for detecting the pipe temperature. The unit has at least a heating function.

[0036] Figure 1 The structure diagram of the unit according to the embodiment of the present application is shown in FIG. 1, which comprises: Figure 1

[0037] An electronic expansion valve 1 is arranged on the main pipeline 4 between the indoor heat exchanger 2 and the outdoor heat exchanger 3; a refrigerant heat dissipation module 5 is arranged on the main pipeline between the outdoor heat exchanger 3 and the electronic expansion valve 1; and a second valve 6 is arranged on a branch pipeline 7, the starting point of the branch pipeline 7 is located between the refrigerant heat dissipation module 5 and the outdoor heat exchanger 3, and the ending point of the branch pipeline 7 is located between the electronic expansion valve 1 and the refrigerant heat dissipation module 5. The second valve 6 in the embodiment can be an electromagnetic valve.

[0038] As shown in FIG. 2, the unit structure is particularly characterized by the refrigerant heat dissipation module 5, the main pipeline 4 (first flow path) and the branch pipeline 7 (second flow path). The refrigerant heat dissipation module 5 is arranged on the main board of the outdoor unit, and the pipeline design guides the refrigerant to flow through the main board to help the heat dissipation of the heating elements on the main board and ensure the efficient operation. Figure 1

[0039] During the heating operation of the unit, the refrigerant flows into the main pipeline 4 after being throttled by the electronic expansion valve 1. The refrigerant flows through the refrigerant heat dissipation module 5 after being throttled by the electronic expansion valve 1, which increases the outdoor heat exchange area and the low-temperature heating capacity.

[0040] A first temperature sensing bag 8 is arranged in the refrigerant heat dissipation module 5, which is located at the inlet of the refrigerant heat dissipation module 5 during the heating operation.

[0041] The starting point of the branch pipeline 7 (second flow path) is located between the outdoor heat exchanger 3 and the refrigerant heat dissipation module 5. The ending point, i.e. the intersection point with the first flow path, is located between the refrigerant heat dissipation module 5 and the electronic expansion valve 1. The second flow path sequentially arranges the second valve 6 (electromagnetic valve) and the one-way valve 9 from the starting point to the ending point. The second valve 6 is used to open or close the second flow path, and the one-way valve 9 is used to avoid the reverse flow of the refrigerant from the ending point to the starting point, so as to ensure that the refrigerant in the second flow path always flows from the starting point to the ending point. Figure 1 ​​The arrow in the middle indicates the flow direction of the refrigerant. Based on the above considerations, the present embodiment provides a preferred implementation, i.e. the above-mentioned unit further comprises: a one-way valve 9 arranged on the branch 7 between the second valve 6 and the end of the branch 7, for controlling the flow direction of the refrigerant from the start to the end of the branch 7. Thus, it can be ensured that the refrigerant in the branch 7 always flows from the start to the end, avoiding the reverse flow of the refrigerant from the end to the start.

[0042] The electronic expansion valve 1 is arranged before the refrigerant heat dissipation module 5, i.e. the refrigerant heat dissipation module 5 is regarded as being incorporated into the outdoor heat exchanger 3 to perform evaporation heat absorption together, i.e. the system is supplemented with heat, which helps to improve the low-temperature heating capacity. However, this design is prone to cause condensation problems of the refrigerant heat dissipation module 5, so the branch 7 (second flow path) is designed synchronously.

[0043] The design of the branch 7 (second flow path) ensures that during the heating operation, after the refrigerant is heated by the refrigerant heat dissipation module 5, part of it directly enters the outdoor heat exchanger 3 to perform evaporation heat absorption; the other part passes through the second flow path and merges with the refrigerant just throttled, thereby increasing the temperature of the refrigerant, so that the refrigerant heat dissipation module 5 will not condense under the premise that the electronic expansion valve 1 maintains sufficient throttling strength. That is, after the branch is opened, the refrigerant after heat absorption is mixed with the throttled refrigerant, thereby increasing the temperature of the refrigerant entering the refrigerant heat dissipation module 5, increasing the condensation throttling strength threshold, and enabling the electronic expansion valve 1 to maintain a higher throttling strength. In the present embodiment, the design of the branch ensures that the throttling strength of the electronic expansion valve 1 is optimized.

[0044] In the control of the condensation risk of the refrigerant heat dissipation module 5 and the frost risk control of the outdoor heat exchanger 3, the temperature data detected by the temperature sensing bulb is used as the basis for adjustment, therefore, the unit of the present embodiment further comprises: a first temperature sensing bulb 8 arranged at the refrigerant inlet of the refrigerant heat dissipation module 5 for detecting the refrigerant temperature; a second temperature sensing bulb 10 arranged at the suction pipe of the compressor 11 for detecting the suction temperature. A four-way valve 12 is arranged on the pipeline between the compressor 11 and the outdoor heat exchanger 3. During the heating operation, the second valve 6 is opened, the refrigerant is throttled by the electronic expansion valve 1, then flows through the refrigerant heat dissipation module 5, and is then divided into two streams, one of which enters the outdoor heat exchanger 3, and the other passes through the second valve 6 to flow through the branch 7, and then returns to the main pipeline 4 and merges with the refrigerant throttled by the electronic expansion valve 1. In this process, the throttling strength of the electronic expansion valve 1 is comprehensively controlled according to the temperatures detected by the first temperature sensing bulb 8 and the second temperature sensing bulb 10, and whether the second valve 6 is opened or closed is determined according to the suction temperature detected by the second temperature sensing bulb 10. The present embodiment incorporates the refrigerant heat dissipation module into the outdoor heat exchanger while ensuring sufficient throttling strength of the electronic expansion valve.

[0045] Embodiment 2

[0046] According to an embodiment of the present application, an embodiment of a unit control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0047] Figure 2 is a flowchart of a unit control method according to an embodiment of the present application, as shown in Figure 2 the method comprises the following steps:

[0048] Step S201, after the unit starts heating operation, the electronic expansion valve and the second valve of the branch are both opened; specifically, the electronic expansion valve is opened by a preset number of steps; and the second valve is opened to open the branch, that is, the refrigerant can flow through the main pipeline and the branch.

[0049] Step S202, detecting whether the refrigerant heat dissipation module has a condensation risk, if so, adjusting the number of steps of the electronic expansion valve.

[0050] Step S203, detecting whether the outdoor heat exchanger has a frosting risk; if so, closing the second valve and adjusting the number of steps of the electronic expansion valve.

[0051] The control scheme of the present embodiment is applied to the unit described above. The setting position of the electronic expansion valve of the unit is on the main pipeline before the refrigerant passes through the refrigerant heat dissipation module, that is, the refrigerant heat dissipation module can be regarded as being integrated into the outdoor heat exchanger to perform evaporation and heat absorption together, thereby supplementing heat for the unit and helping to improve the low-temperature heating capacity. However, the above design is prone to cause the problem of condensation of the refrigerant heat dissipation module, so the design of the branch is synchronized. The design of the branch ensures that during the heating operation, after the refrigerant is heated by the refrigerant heat dissipation module, part of the refrigerant directly enters the outdoor heat exchanger for evaporation and heat absorption, and the other part of the refrigerant passes through the branch and merges with the refrigerant just throttled, thereby increasing the temperature of the refrigerant, so that the refrigerant heat dissipation module will not condense under the premise that the electronic expansion valve maintains sufficient throttling strength.

[0052] In the present embodiment, when detecting whether the refrigerant heat dissipation module has a condensation risk, the temperature of the refrigerant at the inlet of the refrigerant heat dissipation module can be determined by the first temperature sensing pack; it is judged whether the temperature of the refrigerant is less than or equal to a first preset temperature (for example, 18℃); if so, it is determined that the refrigerant heat dissipation module has a condensation risk. Based on this, the temperature of the refrigerant at the inlet of the refrigerant heat dissipation module can be detected to timely and accurately identify whether the refrigerant heat dissipation module condenses, so that corresponding adjustment can be made in time when the refrigerant heat dissipation module has a condensation risk to solve the problem of condensation of the refrigerant heat dissipation module.

[0053] After determining that the refrigerant heat dissipation module has a condensation risk, the number of steps of the electronic expansion valve is increased; after a preset time interval, the refrigerant heat dissipation module is re-detected to determine whether the refrigerant heat dissipation module has a condensation risk. Specifically, the number of steps of the electronic expansion valve can be increased: K1=K1+n1 (for example, n1=5B), so as to reduce the throttling strength of the electronic expansion valve. When the unit is in heating operation, the refrigerant releases heat on the indoor side, and then throttles through the electronic expansion valve. After throttling, the refrigerant pressure becomes weaker, and the heat absorption capacity becomes weaker, so the refrigerant heat dissipation module is less likely to condense. Then, a preset time t1 (for example, t1=60s) is maintained, and the first temperature sensing bag is re-determined to re-detect whether the refrigerant heat dissipation module has a condensation risk. It should be noted that if the refrigerant temperature is greater than the first preset temperature, it means that the refrigerant heat dissipation module does not have a condensation risk, and the number of steps of the electronic expansion valve can be kept unchanged. Based on this, the number of steps of the electronic expansion valve is adjusted to adjust the refrigerant throttling strength, and finally the condensation problem of the refrigerant heat dissipation module is solved.

[0054] In the embodiment, when detecting whether the outdoor heat exchanger has a frosting risk, the suction temperature can be determined by the second temperature sensing bag; it is determined whether the suction temperature is less than or equal to a second preset temperature (for example, 0℃); if yes, it is determined that the outdoor heat exchanger has a frosting risk, the second valve is closed to close the branch, the number of steps of the electronic expansion valve is increased, and after a preset time interval, it is re-detected whether the outdoor heat exchanger has a frosting risk. Considering that the capacity weakening caused by the frosting of the outdoor heat exchanger is stronger than the capacity increase of the system caused by the branch, the second valve needs to be closed, the branch needs to be closed, the suction pressure needs to be increased, and the number of steps of the electronic expansion valve needs to be increased: K1=K1+n1 (for example, n1=5B) to reduce throttling, so as to avoid the frosting. If the outdoor heat exchanger does not have a frosting risk, the throttling can be increased, the number of steps of the electronic expansion valve can be decreased: K1=K1-n1 (for example, n1=5B), the second valve can be kept open, and the first temperature sensing bag and the second temperature sensing bag can be re-determined. Therefore, the frosting of the outdoor heat exchanger can be flexibly and efficiently and accurately alleviated or solved.

[0055] The embodiment can solve the problem that the heating capacity is greatly reduced due to a small heat exchange temperature difference in a low-temperature working condition, solve the problem that the outdoor unit is easy to frost in a low-temperature working condition, solve the problem that the refrigerant is easy to condense when flowing through the refrigerant heat dissipation system after throttling in a heating operation process, and flexibly alleviate the frosting of the outdoor heat exchanger.

[0056] Embodiment 3

[0057] Figure 3 The flow chart of the unit control logic according to the embodiment of the application is shown in FIG. 1, and the method comprises the following steps: Figure 3

[0058] ​After the unit is in heating operation, the valve 6 is opened, that is, the branch (the second flow path) is opened, and the control valve 1 is opened according to a preset step number. Then, it is judged whether the refrigerant heat dissipation module has a condensation risk. If yes, the step number of the valve 1 is increased to reduce throttling. When the unit is in heating operation, the refrigerant releases heat at the indoor side, and then throttles through the electronic expansion valve. After throttling, the refrigerant pressure becomes weaker, and the heat absorption capacity becomes weaker, so the refrigerant heat dissipation module is less likely to have condensation.

[0059] If the refrigerant heat dissipation module does not have a condensation risk, it is further judged whether the outdoor heat exchanger has a frost risk. If yes, the valve 6 is closed to switch the branch. Considering that the capacity weakening caused by the frost of the outdoor heat exchanger is stronger than the capacity increase caused by the branch, the valve 6 needs to be closed to close the branch and increase the suction pressure. Then, the step number of the valve 1 is increased to reduce throttling, so as to avoid the occurrence of the frost condition. If the outdoor heat exchanger does not have a frost risk, the step number of the valve 1 is decreased to increase throttling. The embodiment can solve the problem that the heating capacity is greatly reduced due to a small heat exchange temperature difference in a low-temperature working condition, solve the problem that the outdoor unit is easy to frost in a low-temperature working condition, solve the problem that the refrigerant is easy to condense after throttling and flowing through the refrigerant heat dissipation system in the heating operation process, and can flexibly relieve the frost condition of the outdoor heat exchanger.

[0060] Figure 4 is a detailed flow chart of the unit control logic according to the embodiment of the application, as shown in Figure 4 , the method comprises the following steps:

[0061] 1) When the air conditioner is in heating operation, the valve 6 electromagnetic valve is opened to open the second flow path.

[0062] 2) After the refrigerant flows through the indoor heat exchanger to exchange heat, it reaches the valve 1. The valve 1 adjusts the initial step number to K1 (such as K1=90B), and keeps for a time t1 (such as t1=60s). After throttling through the valve 1, it becomes a low-temperature and low-pressure state, and then flows through the refrigerant heat dissipation module to absorb heat. At this time, because the refrigerant absorbs heat, the refrigerant heat dissipation module has a condensation risk. The temperature of the refrigerant at the inlet of the refrigerant heat dissipation module is monitored through the temperature sensing bag 1. If T 感温包1 ≤ preset value T1 (such as T1=18℃), the refrigerant heat dissipation module has a condensation risk, the step number of the valve 1 needs to be increased to K1=K1+n1 (such as n1=5B) to reduce the throttling intensity (the refrigerant flow will become larger). And keep for a time t1 (such as t1=60s), and re-determine T 感温包1 . When the unit is in heating operation, the refrigerant releases heat at the indoor side, and then throttles through the valve 1. After throttling, the flow becomes larger, the pressure becomes weaker, and the heat absorption capacity becomes weaker, so it is less likely to have condensation. If T 感温包1 > preset value T1 (such as T1=18℃), there is no condensation risk, and the next step is continued.

[0063] The refrigerant heated by the refrigerant heat dissipation module flows through the branch to the end of the flow path, mixes with the throttled refrigerant, and increases the temperature of the refrigerant, thereby directly reducing the risk of condensation of the refrigerant heat dissipation module. In order to ensure that the system does not condense, the system equipped with the refrigerant heat dissipation module will reduce the throttling strength before the refrigerant flows through the heat dissipation module, which will have a greater impact on the low-temperature heating capacity. However, under the premise of increasing the pressure and temperature of the refrigerant after the branch enhances the throttling, the valve 1 can appropriately increase the throttling, so that the system can ensure sufficient throttling strength and effectively improve the low-temperature heating capacity.

[0064] The refrigerant heated by the refrigerant heat dissipation module flows through the branch to the end of the flow path, mixes with the throttled refrigerant, and increases the temperature of the refrigerant, thereby directly reducing the risk of condensation of the refrigerant heat dissipation module. In order to ensure that the system does not condense, the system equipped with the refrigerant heat dissipation module will reduce the throttling strength before the refrigerant flows through the heat dissipation module, which will have a greater impact on the low-temperature heating capacity. However, under the premise of increasing the pressure and temperature of the refrigerant after the branch enhances the throttling, the valve 1 can appropriately increase the throttling, so that the system can ensure sufficient throttling strength and effectively improve the low-temperature heating capacity.

[0065] 3) The temperature sensing bag 2 (detecting the suction temperature, arranged in the suction pipe of the compressor) is used as the suction temperature sensing bag, and the detected temperature T 感温包2 is related to the preset value T2 (such as T2=0℃), if T 感温包2 ≤ the preset value T2 (such as T2=0℃), the outdoor heat exchanger has a risk of frosting, at this time, the capacity weakening caused by frosting is stronger than the capacity increase of the second flow path to the system, so the valve 6 needs to be closed, the branch needs to be closed, the suction pressure needs to be increased, and the step number of the valve 1 needs to be increased to K1=K1+n1 (such as n1=5B), so as to reduce the throttling, thereby avoiding the frosting condition; if T 感温包2 > the preset value T2 (such as T2=0℃), there is no risk of frosting, the throttling can be increased, the step number of the valve 1 can be reduced to K1=K1-n1 (such as n1=5B), and the valve 6 can be kept open, and the T 感温包1 and T 感温包2 are determined again.

[0066] According to the technical scheme of the application, the refrigerant heat dissipation module is additionally arranged on the main pipeline of the unit, and the electronic expansion valve is arranged before the refrigerant flows through the refrigerant heat dissipation module, which is equivalent to integrating the refrigerant heat dissipation module into the outdoor heat exchanger, and the two perform evaporation and heat absorption together. After the refrigerant is throttled by the electronic expansion valve, it flows through the refrigerant heat dissipation system, increases the outdoor heat exchange area, ensures sufficient throttling strength, and increases the low-temperature heating capacity. Moreover, the branch is additionally arranged on the basis of the main pipeline, so that during the heating operation of the unit, part of the refrigerant directly enters the outdoor heat exchanger to perform evaporation and heat absorption, and the other part of the refrigerant flows through the branch and mixes with the refrigerant after being throttled, thereby increasing the temperature of the refrigerant. Under the premise that the electronic expansion valve maintains sufficient throttling strength, the refrigerant heat dissipation module will not condense, thereby flexibly relieving or avoiding the condensation of the refrigerant heat dissipation module.

[0067] Example 4

[0068] corresponding to Figure 2 The unit control method is introduced, and the embodiment provides a unit control device. Figure 5 The structural block diagram of the unit control device is shown in the figure, and the device comprises:

[0069] The control module 10 is used for controlling the electronic expansion valve and the second valve of the branch to be opened after the unit starts heating operation.

[0070] The first adjustment module 20 is connected to the control module 10, and is used for detecting whether the refrigerant heat dissipation module has a condensation risk, and if so, adjusting the step number of the electronic expansion valve.

[0071] The second adjustment module 30 is connected to the first adjustment module 20, and is used for detecting whether the outdoor heat exchanger has a frost risk; if so, closing the second valve and adjusting the step number of the electronic expansion valve.

[0072] The embodiment also provides an air conditioning equipment, which comprises the unit control device introduced above. The technical scheme of the embodiment can be applied to ceiling machines, duct machines, multi-split machines and the like.

[0073] The refrigerant heat dissipation module is additionally arranged on the main pipeline of the unit, and the electronic expansion valve is arranged before the refrigerant flows through the refrigerant heat dissipation module, which is equivalent to integrating the refrigerant heat dissipation module into the outdoor heat exchanger, and the two perform evaporation and heat absorption together. After the refrigerant is throttled by the electronic expansion valve, it flows through the refrigerant heat dissipation system, which increases the outdoor heat exchange area and can ensure sufficient throttling strength and increase the low-temperature heating capacity. Moreover, by additionally arranging the branch on the basis of the main pipeline, during the heating operation of the unit, after the refrigerant passes through the refrigerant heat dissipation module, part of the refrigerant directly enters the outdoor heat exchanger to perform evaporation and heat absorption, and the other part of the refrigerant is combined with the refrigerant just throttled through the branch, so as to improve the temperature of the refrigerant, so that the refrigerant heat dissipation module will not condense under the premise that the electronic expansion valve maintains sufficient throttling strength, thereby flexibly relieving or avoiding the condensation of the refrigerant heat dissipation module.

[0074] Embodiment 5

[0075] The embodiment provides an electronic device for a unit control method, the electronic device comprising: at least one processor; and a memory in communication connection with the at least one processor; wherein

[0076] The memory stores instructions executable by the one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: after a unit starts heating operation, control the electronic expansion valve and the second valve of the branch to be both opened; detect whether the refrigerant heat dissipation module has a condensation risk, and if so, adjust the step number of the electronic expansion valve; detect whether the outdoor heat exchanger has a frosting risk; if so, close the second valve and adjust the step number of the electronic expansion valve.

[0077] Embodiment 6

[0078] The embodiment of the present application provides a software for executing the technical solutions described in the above embodiments and preferred embodiments.

[0079] The embodiment of the present application provides a nonvolatile computer storage medium, which stores computer executable instructions, and the computer executable instructions can execute the unit control method in any method embodiment.

[0080] The storage medium stores the above software, and the storage medium includes but is not limited to an optical disc, a floppy disk, a hard disk, a rewritable memory and the like.

[0081] The above embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0082] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0083] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-described device embodiments are only schematic, for example, the division of the units can be a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0084] The units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0085] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0086] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0087] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. A machine group, characterized by The unit comprises: An electronic expansion valve arranged on a main pipeline between an indoor heat exchanger and an outdoor heat exchanger; A refrigerant heat dissipation module arranged on the main pipeline between the outdoor heat exchanger and the electronic expansion valve; the refrigerant heat dissipation module is arranged on an outdoor unit mainboard, and the refrigerant heat dissipation module and the outdoor heat exchanger jointly perform evaporation heat absorption to increase an outdoor side heat exchange area; A second valve arranged on a branch pipeline, a start point of the branch pipeline being located between the refrigerant heat dissipation module and the outdoor heat exchanger, and an end point of the branch pipeline being located between the electronic expansion valve and the refrigerant heat dissipation module.

2. The machine group according to claim 1, characterized in that The unit further comprises: A one-way valve arranged on the branch pipeline between the second valve and the end point of the branch pipeline, for controlling a flow direction of refrigerant to be from the start point to the end point of the branch pipeline.

3. The crew of claim 1, wherein, The unit further comprises: A first temperature sensing bag arranged at a refrigerant inlet of the refrigerant heat dissipation module, for detecting a refrigerant temperature; A second temperature sensing bag arranged at a suction pipe of the compressor, for detecting a suction temperature.

4. A method of controlling a unit, applied to the unit according to any one of claims 1 to 3, characterized in that, The method comprises: After the unit starts heating operation, the electronic expansion valve and the second valve of the branch pipeline are controlled to be opened; Whether the refrigerant heat dissipation module has a condensation risk is detected, and if so, a step number of the electronic expansion valve is adjusted; Whether the outdoor heat exchanger has a frost risk is detected, and if so, the second valve is closed, and the step number of the electronic expansion valve is adjusted.

5. The method of claim 4, wherein, Controlling the electronic expansion valve and the second valve of the branch pipeline to be opened comprises: Controlling the electronic expansion valve to be opened at a preset step number; and Controlling the second valve to be opened to open the branch pipeline.

6. The method of claim 4, wherein, Whether the refrigerant heat dissipation module has a condensation risk is detected by comprising: Determining, by the first temperature sensing bag, a refrigerant temperature at the inlet of the refrigerant heat dissipation module; Judging whether the refrigerant temperature is less than or equal to a first preset temperature; If so, it is determined that the refrigerant heat dissipation module has a condensation risk.

7. The method of claim 4, wherein, If so, the step number of the electronic expansion valve is adjusted by comprising: If it is determined that the refrigerant heat dissipation module has a condensation risk, the step number of the electronic expansion valve is increased; After a preset time interval, the refrigerant heat dissipation module is detected again to determine whether it has a condensation risk.

8. The method of claim 4, wherein, After detecting whether the refrigerant heat dissipation module has a condensation risk, the method further comprises: If the refrigerant heat dissipation module does not have a condensation risk, the step number of the electronic expansion valve is kept unchanged.

9. The method of claim 4, wherein, Whether the outdoor heat exchanger has a frost risk is detected by comprising: Determining a suction temperature by the second temperature sensing bag; Judging whether the suction temperature is less than or equal to a second preset temperature; If so, it is determined that the outdoor heat exchanger has a frost risk.

10. The method of claim 4, wherein, If so, the second valve is closed, and the step number of the electronic expansion valve is adjusted by comprising: If so, the second valve is closed to close the branch pipeline; The step number of the electronic expansion valve is increased; After a preset time interval, the outdoor heat exchanger is detected again to determine whether it has a frost risk.

11. The method of claim 4, wherein, After detecting whether the outdoor heat exchanger has a frost risk, the method further comprises: If the outdoor heat exchanger does not have a frost risk, the step number of the electronic expansion valve is decreased, and the second valve is kept in an opened state.

12. A machine group control device for implementing the machine group control method according to any one of claims 4 to 11, characterized by The device comprises: A control module, configured to control the electronic expansion valve and the second valve of the branch pipeline to be opened after the unit starts heating operation; The first adjusting module is configured to detect whether the refrigerant heat dissipation module has a condensation risk, and if so, adjust the step number of the electronic expansion valve. The second adjusting module is configured to detect whether the outdoor heat exchanger has a frost risk, and if so, close the second valve and adjust the step number of the electronic expansion valve.

13. An air conditioning apparatus characterized by comprising: The air conditioning equipment comprises the unit control device of claim 12.

14. A computer readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by a processor, implements the method of any one of claims 4 to 11.

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