阅读说明：本技术 控制直膨机机组化霜的方法、装置及相关设备 (Method and device for controlling defrosting of direct expansion unit and related equipment ) 是由 卓明胜 刘金喜 姚远浩 石伟 廖永亮 于 2021-08-16 设计创作，主要内容包括：本申请涉及一种控制直膨机机组化霜的方法、装置及相关设备,控制直膨机机组化霜的方法包括：获取运行信息并检测运行信息是否满足化霜条件；若满足,执行化霜步骤,直至获取到的化霜信息满足退出化霜条件。化霜步骤包括：关闭内风机和外风机；判断压缩机内的吸气压力是否满足第一调整条件,判断冷凝器中的温度是否满足第二调整条件；若吸气压力不满足第一调整条件,开启内风机,并在吸气压力满足第一调整条件,或者内风机的开启时间大于第一设定值时,关闭内风机；若温度满足第二调整条件,开启外风机,并在温度不满足第二调整条件,或者外风机的开启时间大于第二设定值时,关闭外风机。如此,同时兼顾了快速、高效化霜与用户舒适性体验。(The application relates to a method, a device and related equipment for controlling defrosting of a direct expansion unit, wherein the method for controlling defrosting of the direct expansion unit comprises the following steps: acquiring operation information and detecting whether the operation information meets defrosting conditions; and if so, executing a defrosting step until the acquired defrosting information meets the defrosting quitting condition. The defrosting step comprises: closing the inner fan and the outer fan; judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not; if the suction pressure does not meet the first adjusting condition, the inner fan is started, and when the suction pressure meets the first adjusting condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed. Therefore, the rapid and efficient defrosting and the comfortable experience of the user are considered simultaneously.)

1. A method for controlling defrosting of a direct expansion unit is characterized by comprising the following steps:

acquiring operation information, and detecting whether the operation information meets defrosting conditions;

if the operation information meets the defrosting condition, executing a defrosting step until the acquired defrosting information meets the defrosting quitting condition;

the defrosting step comprises the following steps:

closing the inner fan and the outer fan to enable the unit to be in a defrosting state;

judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not;

if the suction pressure does not meet the first adjustment condition, the inner fan is started, and when the suction pressure meets the first adjustment condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

2. The method for controlling defrosting of a direct expansion unit according to claim 1, wherein after the internal fan and the external fan are turned off, and before the judgment whether the suction pressure in the compressor meets the first adjustment condition and the judgment whether the temperature in the condenser meets the second adjustment condition, the method further comprises:

recording defrosting operation time, and detecting whether the defrosting operation time meets a preset condition;

if the defrosting operation time meets a preset condition, executing the subsequent steps; if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition.

3. The method for controlling defrosting of a direct expansion machine set according to claim 2, wherein the preset conditions comprise: the defrosting operation time is greater than a set threshold.

4. The method for controlling defrosting of a direct expansion unit according to claim 1, wherein the turning on the internal fan comprises:

and starting the inner fan at a preset frequency.

5. The method for controlling direct expander unit defrosting according to claim 1, characterized in that said first adjustment condition comprises: the inspiratory pressure is greater than a first threshold; the second adjustment condition includes: the temperature is greater than a second threshold.

6. The method for controlling defrosting of a direct expansion unit according to claim 1, wherein after determining whether the suction pressure in the compressor satisfies the first adjustment condition, the method further comprises:

if the suction pressure meets the first adjusting condition, keeping the inner fan in a closed state;

after determining whether the temperature in the condenser satisfies the second adjustment condition, the method further includes:

and if the temperature does not meet the second adjusting condition, keeping the outer fan in a closed state.

7. The method for controlling defrosting of the direct expansion unit according to claim 1, wherein the detecting whether the operation information meets a defrosting condition comprises:

in response to the operation information including a defrosting interval time, detecting whether the defrosting interval time is greater than a third threshold; if the defrosting interval time is greater than the third threshold, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition;

in response to the operational information including an inner fin liquid tube temperature, detecting whether the inner fin liquid tube temperature is less than a fourth threshold; if the temperature of the inner fin liquid pipe is smaller than the fourth threshold value, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition;

in response to the operation information including the defrosting interval time and the inner fin liquid pipe temperature, detecting whether the defrosting interval time is greater than a third threshold value and whether the inner fin liquid pipe temperature is less than a fourth threshold value; if the defrosting time interval is larger than the third threshold and the temperature of the inner fin liquid pipe is smaller than the fourth threshold, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition.

8. The method for controlling the direct expansion unit to defrost according to claim 1, wherein the obtaining of the defrosting information meets a defrosting exit condition, and comprises:

in response to the defrosting information comprising a defrosting run time, the defrosting run time being greater than a fifth threshold;

responsive to the defrosting information comprising an outer fin liquid tube temperature, the outer fin liquid tube temperature being greater than a sixth threshold;

in response to the defrosting information including the defrosting run time and the outer fin liquid pipe temperature, the defrosting run time is greater than a fifth threshold and the outer fin liquid pipe temperature is greater than a sixth threshold.

9. A device for controlling defrosting of a direct expansion unit is characterized by comprising:

the detection module is used for acquiring operation information and detecting whether the operation information meets defrosting conditions;

the defrosting module is used for executing a defrosting step if the operation information meets the defrosting condition until the acquired defrosting information meets the condition of quitting defrosting; the defrosting step comprises the following steps: closing the inner fan and the outer fan to enable the unit to be in a defrosting state; judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not; if the suction pressure does not meet the first adjustment condition, the inner fan is started, and when the suction pressure meets the first adjustment condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

10. The apparatus of claim 9, wherein after the inner fan and the outer fan are turned off, and before the determination of whether the suction pressure in the compressor meets the first adjustment condition and the determination of whether the temperature in the condenser meets the second adjustment condition, the defrosting module is further configured to:

recording defrosting operation time, and detecting whether the defrosting operation time meets a preset condition;

if the defrosting operation time meets a preset condition, executing the subsequent steps; if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition.

11. An apparatus for controlling defrosting of a direct expansion machine set, comprising:

a processor, and a memory coupled to the processor;

the memory is used for storing a computer program;

the processor is configured to invoke and execute the computer program in the memory to perform the method of any one of claims 1-8.

12. A heat pump unit, characterized in that, comprises the device for controlling defrosting of the direct expansion unit according to claim 11.

13. An air conditioner, characterized in that it comprises a heat pump unit according to claim 12.

Technical Field

The application relates to the technical field of heat pump units, in particular to a method and a device for controlling defrosting of a direct expansion unit and related equipment.

Background

Along with the aggravation of temperature difference in winter and summer, the heat is extremely hot in summer, and is severe in winter, and the demand of the heat pump unit is more vigorous. In winter, the external fins are easy to frost when the heat pump direct expansion machine operates in a heating mode, and the thickness of a frost layer is increased along with the increase of the operation time of the unit, so that the heat exchange effect is greatly deteriorated.

In the related art, a conventional defrosting mode of the existing heat pump direct expansion machine is to turn off a fan for defrosting. However, the manner of directly turning off the fan for defrosting makes no air on the evaporator side in the defrosting process, the heat exchange effect is poor, the temperature and the pressure are very low, low-pressure protection is easy to realize, the defrosting on the condenser side is further influenced by the heat exchange difference on the evaporator side, water generated by defrosting accumulates at the bottom of the condenser to form an ice layer, and defrosting is not clean; and the phenomenon of blowing cold air can occur when the fan is directly started for defrosting in the defrosting process, so that heating is influenced, and the comfortable experience of a user can not be ensured.

Disclosure of Invention

The application provides a method, a device and related equipment for controlling defrosting of a direct expansion unit, which are used for solving the technical problem that efficient and rapid defrosting and user comfort experience cannot be considered simultaneously.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a first aspect of the present application provides a method of controlling defrosting of a direct expansion machine set, including:

acquiring operation information, and detecting whether the operation information meets defrosting conditions;

if the operation information meets the defrosting condition, executing a defrosting step until the acquired defrosting information meets the defrosting quitting condition;

the defrosting step comprises the following steps:

closing the inner fan and the outer fan to enable the unit to be in a defrosting state;

judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not;

if the suction pressure does not meet the first adjustment condition, the inner fan is started, and when the suction pressure meets the first adjustment condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

Optionally, after the inner fan and the outer fan are turned off, and before the determination of whether the suction pressure in the compressor meets the first adjustment condition and the determination of whether the temperature in the condenser meets the second adjustment condition, the method further includes:

recording defrosting operation time, and detecting whether the defrosting operation time meets a preset condition;

if the defrosting operation time meets a preset condition, executing the subsequent steps; if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition.

Optionally, the preset conditions include: the defrosting operation time is greater than a set threshold.

Optionally, the opening the inner fan includes:

and starting the inner fan at a preset frequency.

Optionally, the first adjustment condition includes: the inspiratory pressure is greater than a first threshold; the second adjustment condition includes: the temperature is greater than a second threshold.

Optionally, after determining whether the suction pressure in the compressor satisfies the first adjustment condition, the method further includes:

if the suction pressure meets the first adjusting condition, keeping the inner fan in a closed state;

after determining whether the temperature in the condenser satisfies the second adjustment condition, the method further includes:

and if the temperature does not meet the second adjusting condition, keeping the outer fan in a closed state.

Optionally, the detecting whether the operation information meets a defrosting condition includes:

in response to the operation information including a defrosting interval time, detecting whether the defrosting interval time is greater than a third threshold; if the defrosting interval time is greater than the third threshold, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition;

in response to the operational information including an inner fin liquid tube temperature, detecting whether the inner fin liquid tube temperature is less than a fourth threshold; if the temperature of the inner fin liquid pipe is smaller than the fourth threshold value, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition;

in response to the operation information including the defrosting interval time and the inner fin liquid pipe temperature, detecting whether the defrosting interval time is greater than a third threshold value and whether the inner fin liquid pipe temperature is less than a fourth threshold value; if the defrosting time interval is larger than the third threshold and the temperature of the inner fin liquid pipe is smaller than the fourth threshold, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition.

Optionally, the acquired defrosting information satisfies a defrosting exit condition, including:

in response to the defrosting information comprising a defrosting run time, the defrosting run time being greater than a fifth threshold;

responsive to the defrosting information comprising an outer fin liquid tube temperature, the outer fin liquid tube temperature being greater than a sixth threshold;

in response to the defrosting information including the defrosting run time and the outer fin liquid pipe temperature, the defrosting run time is greater than a fifth threshold and the outer fin liquid pipe temperature is greater than a sixth threshold.

A second aspect of the present application provides an apparatus for controlling defrosting of a direct expansion machine set, comprising:

the detection module is used for acquiring operation information and detecting whether the operation information meets defrosting conditions;

the defrosting module is used for executing a defrosting step if the operation information meets the defrosting condition until the acquired defrosting information meets the condition of quitting defrosting; the defrosting step comprises the following steps: closing the inner fan and the outer fan to enable the unit to be in a defrosting state; judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not; if the suction pressure does not meet the first adjustment condition, the inner fan is started, and when the suction pressure meets the first adjustment condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

Optionally, after the inner fan and the outer fan are turned off, and before the suction pressure in the compressor is judged to meet the first adjustment condition and the temperature in the condenser is judged to meet the second adjustment condition, the defrosting module is further configured to:

recording defrosting operation time, and detecting whether the defrosting operation time meets a preset condition;

if the defrosting operation time meets a preset condition, executing the subsequent steps; if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition.

A third aspect of the present application provides an apparatus for controlling defrosting of a direct expansion machine set, comprising:

a processor, and a memory coupled to the processor;

the memory is used for storing a computer program;

the processor is configured to invoke and execute the computer program in the memory to perform the method according to the first aspect of the application.

A fourth aspect of the application provides a heat pump unit, which comprises the device for controlling defrosting of the direct expansion unit according to the third aspect of the application.

A fifth aspect of the present application provides an air conditioner comprising a heat pump unit as described in the fourth aspect of the present application.

The technical scheme provided by the application can comprise the following beneficial effects:

according to the method and the device for defrosting the aircraft, the operation information is obtained, whether the operation information meets the defrosting condition or not is judged, if yes, the current defrosting treatment is required, so that the defrosting step is executed until the obtained defrosting information meets the condition of quitting defrosting, and the self-adaptive defrosting treatment is realized. When the defrosting step is executed, the inner fan and the outer fan are closed firstly, so that the direct expansion machine set is in a defrosting state. And then judging whether the suction pressure in the compressor meets a first adjusting condition or not and judging whether the temperature in the condenser meets a second adjusting condition or not. If the suction pressure does not satisfy first adjustment condition, then can open interior fan to satisfy first adjustment condition at suction pressure, perhaps when the opening time of interior fan is greater than first setting value, close interior fan, so, the opening time of fan in the control both can improve defrosting efficiency, prevent that the unit low pressure protection from shutting down, can avoid blowing for a long time again, influence customer comfort and experience. Similarly, if the temperature meets the second adjustment condition, the outer fan can be started, and the outer fan is closed when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value. The defrosting method realizes quick and efficient defrosting and comfortable user experience.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart of a method for controlling defrosting of a direct expansion unit according to an embodiment of the present application.

Fig. 2 is a flow chart of a defrosting step according to another embodiment of the present application.

Fig. 3 is a schematic structural diagram of an apparatus for controlling defrosting of a direct expansion unit according to another embodiment of the present application.

Fig. 4 is a schematic structural diagram of an apparatus for controlling defrosting of a direct expansion unit according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, a flowchart of a method for controlling defrosting of a direct expansion unit according to an embodiment of the present application is shown. As shown in the figure, the method for controlling defrosting of the direct expansion unit provided by this embodiment may at least include the following steps:

and 11, acquiring the operation information, and detecting whether the operation information meets defrosting conditions.

When the direct expansion machine set performs heating operation, the inner fan and the outer fan are both in an open state. Based on the method, the operation information of the direct expansion unit can be obtained in real time, and whether the operation information meets the defrosting condition or not is detected so as to judge whether defrosting is needed or not at present.

The operation information may include a defrosting interval time, that is, a last defrosting time and a current time interval. The operation information can also be the temperature of the inner fin liquid pipe, and can also be defrosting interval time and the temperature of the inner fin liquid pipe.

Correspondingly, if the operation information is a defrosting time interval, the defrosting condition is that the defrosting time interval is greater than a third threshold value; if the operation information is the temperature of the inner fin liquid pipe, the defrosting condition is that the temperature of the inner fin liquid pipe is smaller than a fourth threshold value; and if the operation information is the defrosting time interval and the temperature of the inner fin liquid pipe, the defrosting condition is that the defrosting time interval is greater than a third threshold value, and the temperature of the inner fin liquid pipe is less than a fourth threshold value.

In practice, the time setting of the third threshold and the temperature setting of the fourth threshold may be set according to actual requirements, and are not limited herein.

And 12, if the operation information meets the defrosting condition, executing the defrosting step until the acquired defrosting information meets the defrosting quitting condition.

When the defrosting information meets the condition of quitting defrosting, the defrosting treatment is not needed at present, and then the defrosting can be finished, so that the self-adaptive defrosting treatment is realized.

The defrosting information may include defrosting operation time, external fin liquid pipe temperature, defrosting operation time and external fin liquid pipe temperature. Correspondingly, the acquired defrosting information meets the defrosting exiting condition, and the method specifically includes: the defrosting operation time is greater than a fifth threshold value; responding to the defrosting information comprising an outer fin liquid pipe temperature, wherein the outer fin liquid pipe temperature is greater than a sixth threshold value; and responding to the defrosting information comprising defrosting operation time and outer fin liquid pipe temperature, wherein the defrosting operation time is greater than a fifth threshold value, and the outer fin liquid pipe temperature is greater than a sixth threshold value.

Specifically, the time setting of the fifth threshold and the temperature setting of the sixth threshold may be set according to actual requirements, and are not limited herein.

As shown in fig. 2, the defrosting step may include the following sub-steps:

and a substep 1201 of closing the inner fan and the outer fan to enable the unit to be in a defrosting state.

And a substep 1202 of judging whether the suction pressure in the compressor satisfies a first adjustment condition and judging whether the temperature in the condenser satisfies a second adjustment condition.

In the substep 1203, if the suction pressure does not meet the first adjustment condition, turning on the internal fan, and turning off the internal fan when the suction pressure meets the first adjustment condition or the turning-on time of the internal fan is greater than a first set value; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

In this embodiment, the operation information is acquired, whether the operation information meets the defrosting condition is judged, and if yes, it can be determined that the defrosting process is currently required, so that the defrosting step is executed until the acquired defrosting information meets the condition of exiting from defrosting, and the adaptive defrosting process is realized. When the defrosting step is executed, the inner fan and the outer fan are closed firstly, so that the direct expansion machine set is in a defrosting state. And then judging whether the suction pressure in the compressor meets a first adjusting condition or not and judging whether the temperature in the condenser meets a second adjusting condition or not. If the suction pressure does not satisfy first adjustment condition, then can open interior fan to satisfy first adjustment condition at suction pressure, perhaps when the opening time of interior fan is greater than first setting value, close interior fan, so, the opening time of fan in the control both can improve defrosting efficiency, prevent that the unit low pressure protection from shutting down, can avoid blowing for a long time again, influence customer comfort and experience. Similarly, if the temperature meets the second adjustment condition, the outer fan can be started, and the outer fan is closed when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value. The defrosting method realizes quick and efficient defrosting and comfortable user experience.

In the process of executing the defrosting step, the inner fan and the outer fan are closed, after the direct expansion unit starts defrosting, the temperature and the pressure of the evaporator side can be rapidly reduced, so as to avoid the condition that the inner fan and the outer fan are opened and operated too fast, reduce the defrosting efficiency of the unit and the user comfort level experience, after the inner fan and the outer fan are closed, and before judging whether the suction pressure in the compressor meets a first adjusting condition or not and judging whether the temperature in the condenser meets a second adjusting condition or not, the method for controlling the direct expansion unit to defrost further comprises the following steps: recording defrosting operation time, and detecting whether the defrosting operation time meets preset conditions; if the defrosting operation time meets the preset condition, executing the subsequent steps; and if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition.

Wherein the preset condition may include: the defrosting operation time is larger than a set threshold value.

In the implementation, the setting threshold may be one half of the defrosting setting time, so that whether the defrosting operation time meets the preset condition or not is detected, whether the defrosting operation time is greater than one half of the defrosting setting time or not is detected, that is, whether the defrosting operation time reaches one half of the defrosting setting time or not is judged. If the defrosting time does not reach the preset defrosting time, the unit is required to be in a defrosting state continuously until the defrosting operation time reaches half of the defrosting set time; if so, the subsequent steps may be performed.

Specifically, the set threshold may be set according to actual requirements, and is not limited herein.

In some embodiments, the first adjustment condition may include: the suction pressure is greater than a first threshold; the second adjustment condition may include: the temperature is greater than a second threshold.

Based on the above, when the suction pressure in the compressor is larger than a first threshold value, the inner fan is kept in a closed state; when the suction pressure is smaller than or equal to the first threshold value, the inner fan can be started, meanwhile, the starting time of the inner fan is recorded, and the inner fan is closed when the suction pressure is larger than the first threshold value or the starting time of the inner fan reaches a first set value. So, improved the white efficiency of changing, prevented that unit low pressure protection from shutting down, simultaneously, can also compromise customer comfort and experience.

Wherein, when the above-mentioned interior fan that opens, can open interior fan with preset frequency.

Meanwhile, when the temperature in the condenser is less than or equal to a second threshold value, the outer fan is kept in a closed state; and when the temperature is higher than a second threshold value, starting the outer fan, recording the starting time of the outer fan, and closing the outer fan when the temperature is lower than or equal to the second threshold value or the starting time of the outer fan reaches a second set value (for example, the starting time reaches 5 seconds). So, can be fast with the drop of water discharge unit that the upper portion defrosted the production in the condenser, avoided water to converge and flow to the condenser bottom and freeze, improved and defrosted efficiency.

In implementation, the first threshold, the second threshold, the first setting value, the second setting value, and the preset frequency may be set according to actual requirements, which is not limited herein.

In practical application, when the direct expansion machine unit defrosts, the suction pressure of the compressor is monitored, the common low-pressure switch is disconnected at 100KPa, the machine unit reports a fault and stops, the suction pressure is monitored, when the common low-pressure switch is lower than a set lowest pressure value (a first threshold), the inner fan is started and operates at a preset frequency, and when the suction pressure rises to the first threshold or the starting time of the inner fan reaches a first set value, the inner fan is closed. Meanwhile, the temperature of the middle part and the bottom part of the condenser is monitored, when the temperature reaches a set maximum temperature value (a second threshold value), the outer fan is started, and when the temperature is lower than the second threshold value or the starting time of the outer fan reaches a second set value, the outer fan is closed. Therefore, quick and efficient defrosting is realized, and the comfortable experience of the user is ensured while the user is concerned.

Based on the same technical concept, the embodiment of the present application further provides an apparatus for controlling defrosting of a direct expansion unit, as shown in fig. 3, the apparatus may include: the detection module 301 is configured to acquire operation information and detect whether the operation information meets a defrosting condition; the defrosting module 302 is configured to execute a defrosting step if the operation information meets a defrosting condition until the acquired defrosting information meets a defrosting exit condition. Wherein, the defrosting step can comprise: closing the inner fan and the outer fan to enable the unit to be in a defrosting state; judging whether the suction pressure in the compressor meets a first adjusting condition or not, and judging whether the temperature in the condenser meets a second adjusting condition or not; if the suction pressure does not meet the first adjusting condition, the inner fan is started, and when the suction pressure meets the first adjusting condition or the starting time of the inner fan is greater than a first set value, the inner fan is closed; and if the temperature meets the second adjustment condition, the outer fan is started, and when the temperature does not meet the second adjustment condition or the starting time of the outer fan is greater than a second set value, the outer fan is closed.

Optionally, after the inner fan and the outer fan are turned off, and before determining whether the suction pressure in the compressor meets the first adjustment condition and determining whether the temperature in the condenser meets the second adjustment condition, the defrosting module 302 may be further configured to: recording defrosting operation time, and detecting whether the defrosting operation time meets preset conditions; if the defrosting operation time meets the preset condition, executing the subsequent steps; and if the defrosting operation time does not meet the preset condition, keeping the inner fan and the outer fan in a closed state until the defrosting operation time meets the preset condition. Wherein the preset conditions include: the defrosting operation time is larger than a set threshold value.

Optionally, when the inner blower is turned on, the defrosting module 302 is specifically configured to: and starting the fan at a preset frequency.

Optionally, after determining whether the suction pressure in the compressor satisfies the first adjustment condition, the defrosting module 302 may further be configured to: and if the suction pressure meets the first adjusting condition, keeping the inner fan in a closed state. Accordingly, after determining whether the temperature in the condenser satisfies the second adjustment condition, the defrosting module 302 may further be configured to: and if the temperature does not meet the second adjusting condition, keeping the outer fan in a closed state.

Optionally, when detecting whether the operation information meets the defrosting condition, the detecting module 301 may be specifically configured to: detecting whether the defrosting interval time is greater than a third threshold value in response to the operation information including the defrosting interval time; if the defrosting interval time is greater than a third threshold value, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition; detecting whether the inner fin liquid tube temperature is less than a fourth threshold value in response to the operation information comprising the inner fin liquid tube temperature; if the temperature of the inner fin liquid pipe is smaller than a fourth threshold value, the operation information meets the belonged defrosting condition; otherwise, the operation information does not meet the defrosting condition; responding to the operation information including defrosting interval time and inner fin liquid pipe temperature, and detecting whether the defrosting interval time is greater than a third threshold value and whether the inner fin liquid pipe temperature is less than a fourth threshold value; if the defrosting time interval is larger than a third threshold value and the temperature of the inner fin liquid pipe is smaller than a fourth threshold value, the operation information meets the defrosting condition; otherwise, the operation information does not meet the defrosting condition.

Optionally, when the acquired defrosting information meets the defrosting exit condition, the detection module 301 may be specifically configured to: in response to the defrosting information including a defrosting run time, the defrosting run time being greater than a fifth threshold; responding to the defrosting information comprising an outer fin liquid pipe temperature, wherein the outer fin liquid pipe temperature is greater than a sixth threshold value; and responding to the defrosting information comprising defrosting operation time and outer fin liquid pipe temperature, wherein the defrosting operation time is greater than a fifth threshold value, and the outer fin liquid pipe temperature is greater than a sixth threshold value.

For a specific implementation of the device for controlling defrosting of a direct expansion machine set provided in the embodiment of the present application, reference may be made to the implementation of the method for controlling defrosting of a direct expansion machine set described in any of the above examples, and details are not described here again.

Based on the same technical concept, an embodiment of the present application provides an apparatus for controlling defrosting of a direct expansion unit, as shown in fig. 4, the apparatus may specifically include: a processor 401, and a memory 402 connected to the processor 401; the memory 402 is used to store computer programs; the processor 401 is configured to call and execute a computer program in the memory 402 to perform the method for controlling defrosting of the direct expansion machine set according to any of the above embodiments.

For a specific implementation of the apparatus for controlling defrosting of a direct expansion machine set provided in the embodiment of the present application, reference may be made to the implementation of the method for controlling defrosting of a direct expansion machine set described in any of the above examples, and details are not described here again.

Based on the same technical concept, an embodiment of the application further provides a heat pump unit, which comprises the device for controlling the direct expansion unit to defrost as in any embodiment above.

Based on the same technical concept, embodiments of the present application also provide an air conditioner, which may include a heat pump unit as described above.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.