CN115654777B - Defrosting control method and device and heat pump unit - Google Patents
Defrosting control method and device and heat pump unit Download PDFInfo
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- CN115654777B CN115654777B CN202211396391.4A CN202211396391A CN115654777B CN 115654777 B CN115654777 B CN 115654777B CN 202211396391 A CN202211396391 A CN 202211396391A CN 115654777 B CN115654777 B CN 115654777B
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- 238000010257 thawing Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims abstract description 24
- 230000008020 evaporation Effects 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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Abstract
The application relates to a defrosting control method and device and a heat pump unit, and belongs to the field of heat pumps. The defrosting control method comprises the following steps: a: judging whether the ambient temperature is less than or equal to a first threshold value; if yes, executing the step B, and if not, executing the step G; b: judging whether the time from the last defrosting end is more than or equal to a seventh threshold value, if so, executing C, and if not, executing G; c: judging whether the difference value between the ambient temperature and the outer disk temperature is more than or equal to a second threshold value, if so, executing D, if not, judging whether the difference value between the ambient temperature and the evaporation temperature is more than or equal to a third threshold value, if so, executing D, and if not, executing G; d: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing E, if not, judging whether the outer disc temperature is less than or equal to a fifth threshold value, if so, executing E, and if not, executing G; e: judging whether the temperature of the liquid pipe is more than or equal to a sixth threshold value, if so, executing the step F, and if not, executing the step G; f: defrosting the control unit; g: and controlling the machine set to be shut down. The application judges whether defrosting is needed by detecting the parameters of the unit.
Description
Technical Field
The application relates to a defrosting control method and device and a heat pump unit, and belongs to the technical field of air source heat pumps.
Background
When the air source heat pump heats in winter, the outdoor side heat exchanger is an evaporator, the refrigerant absorbs heat and gasifies in the evaporator, so that the temperature of the outer surface of the evaporator is lower than the outdoor temperature, when the temperature of the outer surface of the evaporator is lower than a threshold value, the evaporator frosts, and the frosting of the evaporator can lead to the increase of the heat resistance and the reduction of the air quantity of the heat pump unit, thereby greatly reducing the heat exchange efficiency.
At this time, if the user directly shuts down, the frost on the evaporator cannot be removed, and then when the user turns on the heating again, the heat pump unit automatically enters a defrosting mode, so that the comfort of the user is reduced, and if the evaporator frosts seriously, the heat pump unit is possibly broken down and stopped.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The application aims to overcome the defects in the prior art, and provides a defrosting control method and device and a heat pump unit, so as to solve the problem that frost on an evaporator cannot be removed due to direct shutdown of a user in the related art.
In order to solve the technical problems, the application is realized by adopting the following technical scheme:
in one aspect, the present application provides a defrost control method, comprising the steps of:
step A: after receiving a shutdown signal, detecting the ambient temperature and judging whether the ambient temperature is less than or equal to a first threshold value; if yes, executing the step B, and if not, executing the step G;
and (B) step (B): c, acquiring the time from the last defrosting end and judging whether the time from the last defrosting end is more than or equal to a seventh threshold value, if so, executing the step C, and if not, executing the step G;
step C: detecting the outer disc temperature and judging whether the difference value between the ambient temperature and the outer disc temperature is more than or equal to a second threshold value, if yes, executing the step D, if not, acquiring the evaporation temperature and judging whether the difference value between the ambient temperature and the evaporation temperature is more than or equal to a third threshold value, if yes, executing the step D, and if not, executing the step G;
step D: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing the step E, if not, judging whether the outer disc temperature is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing the step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is more than or equal to a sixth threshold value, if so, executing the step F, and if not, executing the step G;
step F: c, controlling the heat pump unit to enter a defrosting mode, and executing the step G after the defrosting mode is finished;
step G: and controlling the heat pump unit to enter a shutdown program.
Wherein the value range of the first threshold is-5 ℃;
the value range of the second threshold value is 5-15 ℃;
the value range of the third threshold is 5-20 ℃;
the value range of the fourth threshold value is-10 to-2 ℃;
the value range of the fifth threshold value is-5~2 ℃;
the value range of the sixth threshold is 5-20 ℃;
and the value range of the seventh threshold is 10-50 min.
Further, the second threshold value is associated with an ambient temperature, and the higher the ambient temperature is, the larger the second threshold value is in the value range.
Further, the third threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the third threshold is in the value range.
Further, the method for obtaining the evaporation temperature comprises the following steps:
detecting low pressure;
and acquiring a corresponding evaporation temperature according to the detected low-pressure.
In another aspect, the application provides a defrosting control device, which comprises a controller and a detection module connected with the controller, wherein the detection module is used for detecting parameters, and the controller is used for executing the defrosting control method.
Further, the parameters are a plurality of items including an ambient temperature, an outer tray temperature, an evaporation temperature, and a liquid tube temperature.
Further, the detection module includes:
an ambient temperature sensor for detecting an ambient temperature;
the outer disc temperature sensor is used for detecting the outer disc temperature;
the low pressure sensor is used for detecting low pressure and acquiring corresponding evaporation temperature according to the detected low pressure;
and a liquid pipe temperature sensor for detecting the liquid pipe temperature.
Further, the controller is also used for recording the time from the last defrosting end.
Further, the controller adopts a main control board, and the main control board is electrically connected with the low-pressure sensor, the ambient temperature sensor, the outer disc temperature sensor and the liquid pipe temperature sensor.
On the other hand, the application provides a heat pump unit, which comprises the defrosting control device.
Compared with the prior art, the application has the following beneficial effects:
according to the application, under the heating working condition in winter, after a user shutdown signal is received, whether the defrosting condition is achieved is judged by detecting the parameters of the heat pump unit, if the defrosting condition is achieved, the heat pump unit is controlled to enter a defrosting mode, and the frost layer is cleaned and then shutdown is carried out, so that the situation that the frost on the evaporator cannot be cleaned due to direct shutdown of a user is prevented, and the operation reliability and user comfort of the heat pump unit are improved.
Drawings
FIG. 1 is a logic diagram of a defrost control method provided by the present application;
FIG. 2 is a block diagram of a defrost control apparatus provided by the present application;
fig. 3 is a table of evaporation temperatures corresponding to low pressure provided by the present application.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Embodiment one:
as shown in fig. 1, the present embodiment provides a defrosting control method, including the steps of:
step A: after receiving a shutdown signal, detecting the ambient temperature and judging whether the ambient temperature is less than or equal to a first threshold value; if yes, executing the step B, and if not, executing the step G;
and (B) step (B): c, acquiring the time from the last defrosting end and judging whether the time from the last defrosting end is more than or equal to a seventh threshold value, if so, executing the step C, and if not, executing the step G;
step C: detecting the outer disc temperature and judging whether the difference value between the ambient temperature and the outer disc temperature is more than or equal to a second threshold value, if yes, executing the step D, if not, acquiring the evaporation temperature and judging whether the difference value between the ambient temperature and the evaporation temperature is more than or equal to a third threshold value, if yes, executing the step D, and if not, executing the step G;
step D: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing the step E, if not, judging whether the outer disc temperature is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing the step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is more than or equal to a sixth threshold value, if so, executing the step F, and if not, executing the step G;
step F: c, controlling the heat pump unit to enter a defrosting mode, and executing the step G after the defrosting mode is finished;
step G: and controlling the heat pump unit to enter a shutdown program.
In this embodiment, the value range of the first threshold is-5 ℃;
the value range of the second threshold value is 5-15 ℃;
the value range of the third threshold is 5-20 ℃;
the value range of the fourth threshold value is-10 to-2 ℃;
the value range of the fifth threshold value is-5~2 ℃;
the value range of the sixth threshold is 5-20 ℃;
and the value range of the seventh threshold is 10-50 min.
In this embodiment, the second threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the second threshold is in the value range.
In this embodiment, the third threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the third threshold is in the value range.
In this embodiment, the method for obtaining the evaporation temperature includes: the low pressure is detected, and the corresponding evaporation temperature is obtained by looking up the table provided in fig. 3, based on the detected low pressure.
Specifically, in this embodiment, under a heating condition in winter, after receiving a shutdown signal of a user, whether a defrosting condition is reached is determined by detecting parameters of the heat pump unit, and if the defrosting condition is reached, the heat pump unit is controlled to enter a defrosting mode, and shutdown is performed after the frost layer is cleaned.
Embodiment two:
as shown in fig. 2, the present embodiment provides a defrosting control device, which includes a controller and a detection module connected to the controller, wherein the detection module is used for detecting parameters, and the controller is used for executing the defrosting control method described in the first embodiment.
In this embodiment, the parameters are a plurality of items including an ambient temperature, an outer tray temperature, an evaporation temperature, and a liquid tube temperature.
In this embodiment, the detection module includes an ambient temperature sensor, an outer disc temperature sensor, a low pressure sensor and a liquid pipe temperature sensor, where the ambient temperature sensor is used to detect ambient temperature, the outer disc temperature sensor is used to detect outer disc temperature, the low pressure sensor is used to detect low pressure, and according to the detected low pressure, a corresponding evaporation temperature is obtained from fig. 3, and the liquid pipe temperature sensor is used to detect liquid pipe temperature.
In this embodiment, the controller is further configured to record a time from the end of the last defrosting.
In this embodiment, the controller is a main control board, and the main control board is electrically connected with the low-voltage sensor, the ambient temperature sensor, the outer disc temperature sensor and the liquid pipe temperature sensor.
Embodiment III:
the embodiment provides a heat pump unit, which comprises the defrosting control device described in the second embodiment.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present application, and such modifications and variations should also be regarded as being within the scope of the application.
Claims (10)
1. A defrosting control method, characterized by comprising the steps of:
step A: after receiving a shutdown signal, detecting the ambient temperature and judging whether the ambient temperature is less than or equal to a first threshold value; if yes, executing the step B, and if not, executing the step G;
and (B) step (B): c, acquiring the time from the last defrosting end and judging whether the time from the last defrosting end is more than or equal to a seventh threshold value, if so, executing the step C, and if not, executing the step G;
step C: detecting the outer disc temperature and judging whether the difference value between the ambient temperature and the outer disc temperature is more than or equal to a second threshold value, if yes, executing the step D, if not, acquiring the evaporation temperature and judging whether the difference value between the ambient temperature and the evaporation temperature is more than or equal to a third threshold value, if yes, executing the step D, and if not, executing the step G;
step D: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing the step E, if not, judging whether the outer disc temperature is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing the step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is more than or equal to a sixth threshold value, if so, executing the step F, and if not, executing the step G;
step F: c, controlling the heat pump unit to enter a defrosting mode, and executing the step G after the defrosting mode is finished;
step G: controlling the heat pump unit to enter a shutdown program;
wherein the value range of the first threshold is-5 ℃;
the value range of the second threshold value is 5-15 ℃;
the value range of the third threshold is 5-20 ℃;
the value range of the fourth threshold value is-10 to-2 ℃;
the value range of the fifth threshold value is-5~2 ℃;
the value range of the sixth threshold is 5-20 ℃;
and the value range of the seventh threshold is 10-50 min.
2. The defrosting control method as set forth in claim 1, wherein the second threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the second threshold is within the range of values.
3. The defrosting control method as set forth in claim 1, wherein the third threshold is associated with an ambient temperature, and the higher the ambient temperature is, the greater the third threshold is within the range of values.
4. The defrosting control method as set forth in claim 1, wherein the evaporating temperature acquiring method includes:
detecting low pressure;
and acquiring a corresponding evaporation temperature according to the detected low-pressure.
5. A defrost control apparatus comprising a controller and a detection module connected to the controller, the detection module for detecting a parameter, the controller for performing the defrost control method of any one of claims 1 to 4.
6. The defrost control of claim 5, wherein the parameters are a plurality of items including ambient temperature, tray outside temperature, evaporation temperature, and liquid tube temperature.
7. The defrost control of claim 6, wherein the detection module comprises:
an ambient temperature sensor for detecting an ambient temperature;
the outer disc temperature sensor is used for detecting the outer disc temperature;
the low pressure sensor is used for detecting low pressure and acquiring corresponding evaporation temperature according to the detected low pressure;
and a liquid pipe temperature sensor for detecting the liquid pipe temperature.
8. The defrost control apparatus of claim 5 wherein the controller is further configured to record a time from the end of a last defrost.
9. The defrost control apparatus of claim 7, wherein the controller employs a main control board electrically connected to the low pressure sensor, the ambient temperature sensor, the outer tray temperature sensor and the liquid tube temperature sensor.
10. A heat pump unit comprising the defrosting control device according to any one of claims 5 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211396391.4A CN115654777B (en) | 2022-11-09 | 2022-11-09 | Defrosting control method and device and heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211396391.4A CN115654777B (en) | 2022-11-09 | 2022-11-09 | Defrosting control method and device and heat pump unit |
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| CN115654777A CN115654777A (en) | 2023-01-31 |
| CN115654777B true CN115654777B (en) | 2023-12-15 |
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| CN115654777A (en) | 2023-01-31 |
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