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

Abstract

The invention discloses a unit, a unit control method and device, air conditioning equipment and a storage medium. The unit comprises an electronic expansion valve 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; and the second valve is arranged on the branch, the starting point of the branch is located between the refrigerant heat dissipation module and the outdoor heat exchanger, and the end point of the branch 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 flows through the refrigerant heat dissipation module, equivalently, the refrigerant heat dissipation module is merged into the outdoor heat exchanger, the outdoor side heat exchange area is increased, and the low-temperature heating capacity is increased. The branch is additionally arranged on the basis of the main pipeline, the refrigerant after drainage and heat absorption is mixed with the refrigerant after throttling, the electronic expansion valve is made to maintain high throttling strength, and therefore the condensation condition of the refrigerant heat dissipation module is flexibly relieved or avoided.

Description

Technical Field

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

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

[0003] At present, the conventional solutions to increase the low-temperature heating capacity and avoid frost on the outdoor heat exchanger are: adding electric heating on the outdoor side and adding air to increase enthalpy. However, both of the above solutions require the addition of expensive equipment, which is not conducive to widespread promotion.

[0004] With regard to 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, no effective solution has been proposed yet. Summary of the invention

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

[0006] In order to solve the above technical problems, the present invention provides a unit, wherein the unit includes: an electronic expansion valve, which is arranged on the main line between the indoor heat exchanger and the outdoor heat exchanger; a refrigerant heat dissipation module, which is arranged on the main line between the outdoor heat exchanger and the electronic expansion valve; a second valve, which is arranged on a branch line, the starting point of the branch line is located between the refrigerant heat dissipation module and the outdoor heat exchanger, and the end point of the branch line is located between the electronic expansion valve and the refrigerant heat dissipation module.

[0007] Furthermore, the unit also includes: a one-way valve, which is arranged on the branch and located between the second valve and the end point of the branch, and is used to control the flow direction of the refrigerant from the starting point to the end point of the branch.

[0008] Furthermore, the unit also includes: a first temperature sensing package, which is arranged at the refrigerant inlet of the refrigerant heat dissipation module and is used to detect the refrigerant temperature; a second temperature sensing package, which is arranged at the suction pipe of the compressor and is used to detect the suction temperature.

[0009] The present invention also provides a unit control method, which is applied to the above-mentioned unit, wherein the method includes: 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 so, adjusting the step number of the electronic expansion valve; 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.

[0010] Further, controlling the electronic expansion valve and the second valve of the branch to be opened includes: controlling the electronic expansion valve to be opened with a preset number of steps; and controlling the second valve to be opened to open the branch.

[0011] Further, detecting whether the refrigerant heat dissipation module has a condensation risk includes: determining the refrigerant temperature at the inlet of the refrigerant heat dissipation module through a first temperature sensing package; judging whether the refrigerant temperature is less than or equal to a first preset temperature; if so, determining that the refrigerant heat dissipation module has a condensation risk.

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

[0013] Furthermore, after detecting whether the refrigerant heat dissipation module has a condensation risk, the method further includes: if the refrigerant heat dissipation module has no condensation risk, keeping the number of steps of the electronic expansion valve unchanged.

[0014] Further, detecting whether the outdoor heat exchanger has a risk of frost includes: determining the intake air temperature through a second temperature sensing package; judging whether the intake air temperature is less than or equal to a second preset temperature; if so, determining that the outdoor heat exchanger has a risk of frost.

[0015] Further, if yes, close the second valve and adjust the number of steps of the electronic expansion valve, including: if yes, close the second valve to close the branch; increase the number of steps of the electronic expansion valve; after a preset time interval, re-check whether the outdoor heat exchanger has a risk of frost.

[0016] Furthermore, after detecting whether the outdoor heat exchanger has a risk of frost, the method further includes: if the outdoor heat exchanger has no risk of frost, reducing the number of steps of the electronic expansion valve and maintaining the open state of the second valve.

[0017] The present invention also provides a unit control device for implementing the above-mentioned unit control method, wherein the device includes: a control module, used 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, used to detect whether the refrigerant heat dissipation module has a condensation risk, and if so, adjust the step number of the electronic expansion valve; a second adjustment module, used to detect whether the outdoor heat exchanger has a frost risk; if so, close the second valve and adjust the step number of the electronic expansion valve.

[0018] The present invention also provides an air conditioning device, wherein the air conditioning device comprises the above-mentioned unit control device.

[0019] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program implements the above method when executed by a processor.

[0020] By applying the technical solution of the present invention, a refrigerant heat dissipation module is added to the main pipe of the unit, and the electronic expansion valve is set before the refrigerant flows through the refrigerant heat dissipation module, which is equivalent to incorporating the refrigerant heat dissipation module into the outdoor heat exchanger. The two evaporate and absorb heat together. The refrigerant is throttled by the electronic expansion valve before flowing through the refrigerant heat dissipation module, which increases the outdoor heat exchange area and the low-temperature heating capacity. In addition, by adding a branch pipe on the basis of the main pipe, 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, and the throttling intensity threshold of condensation is increased, so that the electronic expansion valve can maintain a higher throttling intensity, thereby flexibly alleviating or avoiding the condensation of the refrigerant heat dissipation module. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 is a flow chart of a unit control method according to an embodiment of the present invention;

[0023] Figure 3 is a flow chart of the unit control logic according to an embodiment of the present invention;

[0024] Figure 4 is a detailed flow chart of the control logic of the unit according to an embodiment of the present invention;

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

[0026] Reference numerals:

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

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0030] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0032] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0033] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] In order to solve the problem of how to effectively solve the frost of the outdoor heat exchanger and improve the low-temperature heating capacity of the unit in the prior art, this embodiment provides a unit. The unit includes at least one indoor unit, one outdoor unit, an electronic expansion valve for controlling the flow of refrigerant in the outer heat exchanger, and a temperature sensing package for detecting the pipe temperature. The unit has at least a heating function.

[0036] Figure 1 is a schematic diagram of the structure of a unit according to an embodiment of the present invention, such as Figure 1 As shown, the unit includes:

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

[0038] like Figure 1 As shown, the unit structure is special in that it has a refrigerant heat dissipation module 5, a main flow path 4 (first flow path) and a branch flow path 7 (second flow path). The refrigerant heat dissipation module 5 is arranged on the outdoor unit main board, and the refrigerant is guided to flow through the main board through the pipeline design, which helps the heat dissipation of the main board's heating elements and ensures its efficient operation.

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

[0040] A first temperature sensing package 8 is provided in the refrigerant heat dissipation module 5 and is located at the inlet where the refrigerant flows into the refrigerant heat dissipation module 5 during the heating operation.

[0041] The starting point of the branch 7 (second flow path) is located between the outdoor heat exchanger 3 and the refrigerant heat dissipation module 5. The end point, that is, the intersection with the first flow path, is located between the refrigerant heat dissipation module 5 and the electronic expansion valve 1. The second flow path is arranged in sequence from the starting point to the end point. The second valve 6 (solenoid valve) and the one-way valve 9 are used to open or close the second flow path, and the one-way valve 9 is used to prevent the refrigerant from flowing back from the end point to the starting point, ensuring that the refrigerant in the second flow path always flows from the starting point to the end point. Figure 1The middle arrow indicates the flow direction of the refrigerant. Based on the above considerations, this embodiment provides a preferred implementation, that is, the above unit also includes: a one-way valve 9, which is arranged on the branch 7, between the second valve 6 and the end of the branch 7, and is used to control the flow direction of the refrigerant from the starting point to the end point of the branch 7. This ensures that the refrigerant in the branch 7 always flows from the starting point to the end point, and prevents the refrigerant from flowing back from the end point to the starting point.

[0042] The electronic expansion valve 1 is set before the refrigerant heat dissipation module 5, which can be regarded as incorporating the refrigerant heat dissipation module 5 into the outdoor heat exchanger 3, and evaporation and heat absorption are performed together, which adds heat to the system and helps to improve the low-temperature heating capacity. However, this design is prone to condensation of the refrigerant heat dissipation module 5, so the branch 7 (second flow path) is set simultaneously.

[0043] The design of branch 7 (second flow path) ensures that during the heating operation, after the refrigerant is heated by the refrigerant heat dissipation module 5, a part of the refrigerant directly enters the outdoor heat exchanger 3 for evaporation and heat absorption; the other part passes through the second flow path and merges with the refrigerant that has just been throttled to increase its temperature, 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 the drainage and heat absorption is mixed with the refrigerant after throttling, which increases the temperature of the refrigerant entering the refrigerant heat dissipation module 5 and increases the throttling strength threshold of condensation, so that the electronic expansion valve 1 can maintain a higher throttling strength. The design of the branch in this embodiment ensures that the throttling strength of the electronic expansion valve 1 is optimized.

[0044] In the condensation risk control 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 package is needed as the adjustment basis. Therefore, the unit of this embodiment also includes: a first temperature sensing package 8, which is arranged at the refrigerant inlet of the refrigerant heat dissipation module 5, for detecting the refrigerant temperature; a second temperature sensing package 10, which is 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, and the refrigerant flows through the refrigerant heat dissipation module 5 after being throttled by the electronic expansion valve 1, and then splits into two streams, one of which enters the outdoor heat exchanger 3, and the other flows through the branch 7 through the second valve 6, and then returns to the main line 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 package 8 and the second temperature sensing package 10, and whether to open or close the second valve 6 is determined according to the suction temperature detected by the second temperature sensing package 10. This embodiment integrates the refrigerant heat exchange module into the outdoor heat exchanger while ensuring sufficient throttling strength of the electronic expansion valve.

[0045] Example 2

[0046] According to an embodiment of the present invention, 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 can be executed in an order different from that shown here.

[0047] Figure 2 is a flow chart of a unit control method according to an embodiment of the present invention. Figure 2 As shown, 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 controlled to open; specifically, the electronic expansion valve is controlled to open with a preset number of steps; and the second valve is controlled to open to open the branch, that is, the refrigerant can flow through the main line and the branch.

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

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

[0051] The control scheme of this embodiment is applied to the unit introduced above. The setting position of the electronic expansion valve of the unit is on the main pipe before the refrigerant passes through the refrigerant heat dissipation module, which can be regarded as incorporating the refrigerant heat dissipation module into the outdoor heat exchanger to perform evaporation and heat absorption together, thereby supplementing heat for the unit and helping to increase the low-temperature heating capacity. However, the above design is prone to cause condensation problems in the refrigerant heat dissipation module, so a branch circuit design is set up simultaneously. The branch circuit design ensures that during the heating operation, after the refrigerant is heated by the refrigerant heat dissipation module, a part of the refrigerant directly enters the outdoor heat exchanger for evaporation and heat absorption, and the other part passes through the branch circuit to merge with the refrigerant that has just been throttled, thereby raising the refrigerant temperature and preventing condensation in the refrigerant heat dissipation module under the premise that the electronic expansion valve maintains sufficient throttling intensity.

[0052] When detecting whether the refrigerant heat dissipation module has a condensation risk, this embodiment can specifically determine the refrigerant temperature at the inlet of the refrigerant heat dissipation module through the first temperature sensing package; determine whether the refrigerant temperature is less than or equal to the first preset temperature (for example, 18°C); if so, determine that the refrigerant heat dissipation module has a condensation risk. Based on this, by detecting the refrigerant temperature at the inlet of the refrigerant heat dissipation module, it is possible to timely and accurately identify whether condensation occurs in the refrigerant heat dissipation module, so that corresponding adjustments can be made in time when the refrigerant heat dissipation module has a condensation risk to solve the condensation problem 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 for condensation risk. Specifically, the number of steps of the electronic expansion valve can be increased: K1=K1+n1 (for example, n1=5B) to reduce the throttling intensity of the electronic expansion valve. When the unit is in heating operation, the refrigerant releases heat on the indoor side, and then passes through the electronic expansion valve for throttling. After reducing the throttling, the refrigerant pressure will become weaker, and the heat absorption capacity will become weaker, so the refrigerant heat dissipation module is less likely to produce condensation. After that, the preset time t1 (for example, t1=60s) is maintained, and the first temperature sensing package 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 has no condensation risk, and the number of steps of the electronic expansion valve can continue to remain unchanged. Based on this, the refrigerant throttling intensity is adjusted by adjusting the number of steps of the electronic expansion valve, and finally the condensation problem of the refrigerant heat dissipation module is solved.

[0054] In this embodiment, when detecting whether the outdoor heat exchanger has a risk of frost, the suction temperature can be determined by the second temperature sensing package; it is determined whether the suction temperature is less than or equal to the second preset temperature (for example, 0°C); if so, it is determined that the outdoor heat exchanger has a risk of frost, and the second valve is closed to close the branch; the number of steps of the electronic expansion valve is increased; after a preset time interval, the outdoor heat exchanger is re-detected to see if there is a risk of frost. Considering that the capacity weakening caused by the frost of the outdoor heat exchanger is stronger than the increase in the system capacity of the branch, it is necessary to close the second valve, close the branch, increase the suction pressure, and increase the number of steps of the electronic expansion valve: K1=K1+n1 (for example, n1=5B), reduce throttling, and thus avoid the occurrence of frost. If there is no risk of frost on the outdoor heat exchanger, the throttling can be continued to be increased, the number of steps of the electronic expansion valve can be reduced, K1=K1-n1 (for example, n1=5B), and the second valve can be kept open, and the first temperature sensing package and the second temperature sensing package can be re-determined. This makes it possible to flexibly, efficiently and accurately alleviate or resolve the frosting of the outdoor heat exchanger.

[0055] This embodiment can solve the problem of greatly reduced heating capacity due to small heat exchange temperature difference when heating under low temperature conditions, solve the problem of frosting of the outdoor unit when heating under low temperature conditions, and solve the problem of condensation when the refrigerant is throttled before flowing through the refrigerant heat dissipation system during heating operation. It can flexibly alleviate frosting of the outdoor heat exchanger.

[0056] Example 3

[0057] Figure 3 is a flow chart of the unit control logic according to an embodiment of the present invention, such as Figure 3 As shown, the method comprises the following steps:

[0058] After the unit is in heating operation, valve 2 is opened, that is, the branch (second flow path) is opened, and control valve 1 is opened according to the preset number of steps. Then, it is determined whether there is a risk of condensation in the refrigerant heat dissipation module. If so, the number of steps of valve 1 is increased to reduce throttling. When the unit is in heating operation, the refrigerant releases heat on the indoor side and then passes through the electronic expansion valve for throttling. After reducing the throttling, the refrigerant pressure will become weaker, and the heat absorption capacity will become weaker, so the refrigerant heat dissipation module is less likely to produce condensation.

[0059] If the refrigerant heat dissipation module has no condensation risk, it is further determined whether the outdoor heat exchanger has a frost risk. If so, valve 2 is closed and the branch is switched. Considering that the capacity weakening caused by the frost on the outdoor heat exchanger is stronger than the increase in the system capacity caused by the branch, it is necessary to close valve 2, close the branch, and increase the suction pressure. Then increase the number of steps of valve 1 to reduce throttling, thereby avoiding the occurrence of frost. If the outdoor heat exchanger has no frost risk, reduce the number of steps of valve 1 to increase throttling. This embodiment can solve the problem of greatly reduced heating capacity due to the small heat exchange temperature difference when heating under low temperature conditions, solve the problem of easy frost on the outdoor unit when heating under low temperature conditions, and solve the problem of easy condensation of the refrigerant after throttling through the refrigerant heat dissipation system during heating operation. It can more flexibly alleviate the frosting of the outdoor heat exchanger.

[0060] Figure 4 is a detailed flow chart of the unit control logic according to an embodiment of the present invention, such as Figure 4 As shown, the method comprises the following steps:

[0061] 1) When the air conditioner is running in heating mode, the solenoid valve of valve 2 opens, opening the second flow path.

[0062] 2) After the refrigerant passes through the indoor heat exchanger and exchanges heat, it reaches valve 1. The initial step number of valve 1 adjustment is K1 (such as K1=90B) and is maintained for time t1 (such as t1=60s). After throttling through 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 the risk of condensation. The refrigerant temperature at the inlet of the refrigerant heat dissipation module is monitored by temperature sensing package 1. If T 感温包1 ≤ preset value T1 (e.g. T1=18℃), the refrigerant cooling module is at risk of condensation, and the number of steps of valve 1 needs to be increased to K1=K1+n1 (e.g. n1=5B), and the throttling intensity of valve 1 needs to be reduced (the refrigerant flow rate will increase). And keep the time t1 (e.g. t1=60s), and adjust T 感温包1 Re-determine. When the unit is running in heating mode, the refrigerant releases heat on the indoor side, and then passes through valve 1 for throttling, the flow rate increases, and the pressure becomes weaker after throttling, the heat absorption capacity becomes weaker, and it is less likely to produce condensation. If T 感温包1 > preset value T1 (such as T1=18℃), there is no condensation risk and proceed to the next step.

[0063] After the refrigerant flows through the refrigerant heat dissipation module and is heated, one of the refrigerants flows to the end of the flow path through the branch, mixes with the throttled refrigerant, increases its temperature, and directly reduces the risk of condensation in the refrigerant heat dissipation module. In order to ensure that there is no condensation, the system equipped with the refrigerant heat dissipation module will usually reduce the throttling intensity before flowing through the heat dissipation module, which will have a greater impact on the low-temperature heating capacity. However, under the premise of installing a branch to increase the refrigerant pressure and temperature after throttling, valve 1 can appropriately increase the throttling so that the system can ensure sufficient throttling intensity and effectively increase the low-temperature heating capacity.

[0064] After the refrigerant passes through the refrigerant heat dissipation module and is heated, the other part directly flows into the outdoor heat exchanger for evaporation and heat absorption. Because the valve 1 is set before passing through the refrigerant heat dissipation module, it can be regarded as integrating the refrigerant heat dissipation module into the outdoor heat exchanger to perform evaporation and heat absorption together, which replenishes heat for the system and helps to increase the low-temperature heating capacity.

[0065] 3) Temperature sensor 2 (which detects the suction temperature and is installed in the suction pipe of the compressor) is used as the suction temperature sensor to determine the detected temperature T 感温包2 Relationship with preset value T2 (such as T2=0℃), if T 感温包2 ≤ preset value T2 (such as T2=0℃), the outdoor heat exchanger is at risk of frosting. At this time, the capacity weakening caused by frosting is stronger than the increase in system capacity caused by the second flow path, so it is necessary to close valve 2, close the branch, increase the suction pressure, and increase the number of steps of valve 1 to K1=K1+n1 (such as n1=5B) to reduce throttling and avoid frosting. If T 感温包2 > preset value T2 (e.g. T2=0℃), there is no risk of frost formation, and the throttling can be further increased, and the number of steps of valve 1 can be reduced to K1=K1-n1 (e.g. n1=5B), and valve 2 can be kept open, and T2 can be adjusted again. 感温包1 and T 感温包2 Make a judgment.

[0066] By applying the technical solution of the present invention, a refrigerant heat dissipation module is added to the main pipe of the unit, and the electronic expansion valve is set before the refrigerant flows through the refrigerant heat dissipation module, which is equivalent to incorporating the refrigerant heat dissipation module into the outdoor heat exchanger. The two perform evaporation and heat absorption together. The refrigerant is first throttled by the electronic expansion valve and then flows through the refrigerant heat dissipation system, which increases the outdoor heat exchange area, can ensure sufficient throttling intensity, and increases the low-temperature heating capacity. In addition, by adding a branch line on the basis of the main pipe, during the heating operation of the unit, after the refrigerant passes through the refrigerant heat dissipation module, a part of it directly enters the outdoor heat exchanger for evaporation and heat absorption, and the other part merges with the refrigerant that has just been throttled through the branch line to increase its temperature, so that the refrigerant heat dissipation module will not condense under the premise that the electronic expansion valve maintains sufficient throttling intensity, thereby flexibly alleviating or avoiding the condensation of the refrigerant heat dissipation module.

[0067] Example 4

[0068] Corresponds to Figure 2 The unit control method described in this embodiment provides a unit control device, such as Figure 5 The structural block diagram of the unit control device shown in FIG. 1 includes:

[0069] The control module 10 is used to control the electronic expansion valve and the second valve of the branch to open after the unit starts heating operation;

[0070] The first adjustment module 20 is connected to the control module 10 and is used to detect whether there is a condensation risk in the refrigerant heat dissipation module, and if so, adjust the number of steps of the electronic expansion valve;

[0071] The second adjustment module 30 is connected to the first adjustment module 20 and is used to detect whether the outdoor heat exchanger has a risk of frost; if so, the second valve is closed and the number of steps of the electronic expansion valve is adjusted.

[0072] This embodiment also provides an air conditioning device, which includes the above-mentioned unit control device. The technical solution of this embodiment can be applied to equipment such as a skylight unit, a duct unit, and a multi-split unit.

[0073] A refrigerant heat dissipation module is added to the main pipeline of the unit, and the electronic expansion valve is set before the refrigerant flows through the refrigerant heat dissipation module, which is equivalent to incorporating the refrigerant heat dissipation module into the outdoor heat exchanger. The two evaporate and absorb heat together. The refrigerant is throttled by the electronic expansion valve first, and then flows through the refrigerant heat dissipation system, which increases the outdoor heat exchange area, can ensure sufficient throttling intensity, and increase low-temperature heating capacity. In addition, by adding a branch line on the basis of the main pipeline, during the heating operation of the unit, after the refrigerant passes through the refrigerant heat dissipation module, a part of it directly enters the outdoor heat exchanger for evaporation and heat absorption, and the other part merges with the refrigerant that has just been throttled through the branch line to increase its temperature, so that the refrigerant heat dissipation module will not condense under the premise that the electronic expansion valve maintains sufficient throttling intensity, thereby flexibly alleviating or avoiding the condensation of the refrigerant heat dissipation module.

[0074] Example 5

[0075] This embodiment provides an electronic device, which is used in a unit control method, and the electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein:

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

[0077] Example 6

[0078] The embodiment of the present invention provides a software, which is used to execute the technical solutions described in the above embodiment and preferred implementation manner.

[0079] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the unit control method in any of the above method embodiments.

[0080] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: a CD, a floppy disk, a hard disk, an erasable memory, etc.

[0081] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0082] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0084] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0085] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0086] If the integrated unit is implemented in the form of a software functional 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 solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. 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 invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A unit, characterized in that: The unit comprises: An electronic expansion valve is arranged on the main pipe between the indoor heat exchanger and the outdoor heat exchanger; A refrigerant heat dissipation module is arranged on the main pipe between the outdoor heat exchanger and the electronic expansion valve; The second valve is arranged on a branch line, the starting point of the branch line is located between the refrigerant heat dissipation module and the outdoor heat exchanger, and the end point of the branch line is located between the electronic expansion valve and the refrigerant heat dissipation module.

2. The unit according to claim 1, characterized in that: The unit also includes: The one-way valve is arranged on the branch, located between the second valve and the end point of the branch, and is used to control the flow direction of the refrigerant from the starting point to the end point of the branch.

3. The unit according to claim 1, characterized in that: The unit also includes: A first temperature sensing package, arranged at the refrigerant inlet of the refrigerant heat dissipation module, for detecting the refrigerant temperature; The second temperature sensing package is arranged at the suction pipe of the compressor and is used for detecting the suction temperature.

4. A unit control method, 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 are both controlled to open; Check whether there is condensation risk in the refrigerant cooling module. If yes, adjust the number of steps of the electronic expansion valve; Detect whether the outdoor heat exchanger has a risk of frost; if so, close the second valve and adjust the number of steps of the electronic expansion valve.

5. The method according to claim 4, characterized in that Control the electronic expansion valve and the second valve of the branch to open, including: Controlling the electronic expansion valve to open with a preset number of steps; and, The second valve is controlled to open to open the branch.

6. The method according to claim 4, characterized in that Check whether the refrigerant cooling module has condensation risk, including: Determining the refrigerant temperature at the inlet of the refrigerant heat dissipation module by a first temperature sensing package; Determining whether the refrigerant temperature is less than or equal to a first preset temperature; If yes, it is determined that the refrigerant heat dissipation module has a condensation risk.

7. The method according to claim 4, characterized in that If yes, adjust the steps of the electronic expansion valve, including: If it is determined that the refrigerant heat dissipation module has a risk of condensation, increasing the number of steps of the electronic expansion valve; After a preset time interval, recheck whether the refrigerant cooling module has condensation risk.

8. The method according to claim 4, characterized in that After detecting whether the refrigerant heat dissipation module has a condensation risk, the method further includes: If there is no condensation risk in the refrigerant heat dissipation module, the number of steps of the electronic expansion valve is kept unchanged.

9. The method according to claim 4, characterized in that Check whether the outdoor heat exchanger has the risk of frost, including: Determine the suction temperature through the second temperature sensing package; Determining whether the intake air temperature is less than or equal to a second preset temperature; If yes, it is determined that the outdoor heat exchanger has a risk of frost.

10. The method according to claim 4, characterized in that If yes, then close the second valve and adjust the number of steps of the electronic expansion valve, including: If yes, closing the second valve to close the branch; increasing the number of steps of the electronic expansion valve; After a preset time interval, recheck whether the outdoor heat exchanger has a risk of frost.

11. The method according to claim 4, characterized in that After detecting whether the outdoor heat exchanger has a risk of frost, the method further includes: If there is no risk of frost on the outdoor heat exchanger, the number of steps of the electronic expansion valve is reduced, and the second valve is kept open.

12. A unit control device, used to implement the unit control method according to any one of claims 4 to 11, characterized in that: The device comprises: The control module is used to control the electronic expansion valve and the second valve of the branch to open after the unit starts heating operation; The first adjustment module is used to detect whether there is a condensation risk in the refrigerant heat dissipation module, and if so, adjust the number of steps of the electronic expansion valve; The second adjustment module is used to detect whether the outdoor heat exchanger has a risk of frost; if so, the second valve is closed and the number of steps of the electronic expansion valve is adjusted.

13. An air conditioning device, characterized in that: The air conditioning equipment includes the unit control device according to claim 12.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 4 to 11 is implemented.

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