CN115654777A - 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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- CN115654777A CN115654777A CN202211396391.4A CN202211396391A CN115654777A CN 115654777 A CN115654777 A CN 115654777A CN 202211396391 A CN202211396391 A CN 202211396391A CN 115654777 A CN115654777 A CN 115654777A
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- 238000010257 thawing Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 24
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 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
- 239000012530 fluid Substances 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 invention relates to a defrosting control method, a defrosting control 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 B, if not, executing G; b: judging whether the time from the last defrosting end is larger than or equal to a seventh threshold, if so, executing C, and otherwise, executing G; c: judging whether the difference value of the ambient temperature and the temperature of the outer disc is larger than or equal to a second threshold value, if so, executing step D, otherwise, judging whether the difference value of the ambient temperature and the evaporating temperature is larger than or equal to a third threshold value, if so, executing step D, and if not, executing step G; d: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing E, otherwise, judging whether the temperature of the outer disc is less than or equal to a fifth threshold value, if so, executing E, and otherwise, executing G; e: judging whether the temperature of the liquid pipe is larger than or equal to a sixth threshold value, if so, executing F, and otherwise, executing G; f: controlling the unit to defrost; g: and controlling the unit to shut down. The invention judges whether defrosting is needed or not by detecting the parameters of the unit.
Description
Technical Field
The invention relates to a defrosting control method, a defrosting control device and a heat pump unit, and belongs to the technical field of air source heat pumps.
Background
When the air source heat pump performs heating operation in winter, the outdoor heat exchanger is an evaporator, refrigerant absorbs heat in the evaporator and is gasified, 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, the frosting of the evaporator can cause the increase of the thermal resistance of the heat pump unit and the reduction of the air volume, and the heat exchange efficiency is greatly reduced.
At this moment, if the user directly shuts down then can lead to the frost on the evaporimeter can't clear away, then when the user starts the heating once more, heat pump set can automatic entering defrosting mode, leads to user's travelling comfort to descend, if the evaporimeter frosting is comparatively serious, still can lead to heat pump set fault shutdown.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a defrosting control method, a defrosting control device and a heat pump unit to solve the problem that in the related art, frost on an evaporator cannot be removed due to direct shutdown of a user.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
in one aspect, the present invention provides a defrost control method, including the steps of:
step A: after a shutdown signal is received, 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, otherwise, executing the step G;
and B, step B: acquiring the time from the last defrosting end and judging whether the time from the last defrosting end is larger than or equal to a seventh threshold, if so, executing the step C, and if not, executing the step G;
step C: detecting the temperature of the outer disc and judging whether the difference value between the ambient temperature and the temperature of the outer disc is larger than or equal to a second threshold value or not, if so, executing a step D, otherwise, acquiring the evaporation temperature and judging whether the difference value between the ambient temperature and the evaporation temperature is larger than or equal to a third threshold value or not, if so, 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 a step E, otherwise, judging whether the temperature of the outer disc is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing a step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is larger than or equal to a sixth threshold value or not, if so, executing a step F, and otherwise, executing a step G;
step F: 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 to 5 ℃;
the value range of the second threshold is 5 to 15 ℃;
the value range of the third threshold is 5 to 20 ℃;
the value range of the fourth threshold is-10 to-2 ℃;
the value range of the fifth threshold is-5 to 2 ℃;
the value range of the sixth threshold is 5 to 20 ℃;
the value range of the seventh threshold is 10 to 50min.
Further, the second threshold is associated with the ambient temperature, and the higher the ambient temperature is, the larger the value of the second threshold is within the value range.
Further, the third threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the value of the third threshold is within the value range.
Further, the method for acquiring the evaporation temperature comprises the following steps:
detecting low pressure;
and acquiring the corresponding evaporation temperature according to the detected low-pressure.
In another aspect, the present invention provides a defrosting control device, including a controller and a detection module connected to the controller, where the detection module is used to detect parameters, and the controller is used to execute the above defrosting control method.
Further, the parameters are a plurality of terms including ambient temperature, outer disc temperature, evaporation temperature and 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 temperature of the outer disc;
the low-pressure sensor is used for detecting low-pressure and acquiring corresponding evaporation temperature according to the detected low-pressure;
and the liquid pipe temperature sensor is used for detecting the temperature of the liquid pipe.
Further, the controller is also configured to record the time since the last defrost.
Further, the controller adopts the main control board, the main control board with low pressure sensor the ambient temperature sensor the outer dish temperature sensor with liquid pipe temperature sensor electric connection.
In another aspect, the present invention provides a heat pump unit, including the above defrosting control device.
Compared with the prior art, the invention has the following beneficial effects:
the invention can judge whether the defrosting condition is achieved or not by detecting the parameters of the heat pump unit after receiving the shutdown signal of the user under the heating working condition in winter, and if the defrosting condition is achieved, the heat pump unit is controlled to enter the defrosting mode, and the frost layer is removed and then shutdown is carried out, thereby preventing the situation that the frost on the evaporator cannot be removed due to the direct shutdown of the user, and increasing the operation reliability of the heat pump unit and the comfort of the user.
Drawings
FIG. 1 is a logic diagram of a defrost control method provided by the present invention;
FIG. 2 is a block diagram of a defrost control apparatus provided by the present invention;
fig. 3 is a table of evaporating temperatures corresponding to low pressure provided by the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a defrosting control method, including the steps of:
step A: after a shutdown signal is received, 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, otherwise, executing the step G;
and B: acquiring time from the end of last defrosting and judging whether the time from the end of last defrosting is larger than or equal to a seventh threshold, if so, executing the step C, and if not, executing the step G;
and C: detecting the temperature of the outer disc and judging whether the difference value between the ambient temperature and the temperature of the outer disc is larger than or equal to a second threshold value or not, if so, executing a step D, otherwise, acquiring the evaporation temperature and judging whether the difference value between the ambient temperature and the evaporation temperature is larger than or equal to a third threshold value or not, if so, 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 a step E, otherwise, judging whether the temperature of the outer disc is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing a step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is larger than or equal to a sixth threshold value, if so, executing a step F, and if not, executing a step G;
step F: 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 the embodiment, the value range of the first threshold is-5 to 5 ℃;
the value range of the second threshold is 5 to 15 ℃;
the value range of the third threshold is 5 to 20 ℃;
the value range of the fourth threshold is-10 to-2 ℃;
the value range of the fifth threshold is-5 to 2 ℃;
the value range of the sixth threshold is 5 to 20 ℃;
the value range of the seventh threshold is 10 to 50min.
In this embodiment, the second threshold is associated with an ambient temperature, and the higher the ambient temperature is, the larger the value of the second threshold is within the value range.
In this embodiment, the third threshold is associated with the ambient temperature, and the higher the ambient temperature is, the larger the value of the third threshold is within the value range.
In this embodiment, the method for obtaining the evaporation temperature includes: the low pressure is detected and the corresponding evaporating temperature is obtained by looking up the table provided in fig. 3 according to the detected low pressure.
Specifically, in this embodiment, under the working condition of heating in winter, after receiving a user shutdown signal, 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 the shutdown is performed after a frost layer is removed.
Example 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, where the detection module is used to detect a parameter, and the controller is used to execute the defrosting control method according to the first embodiment.
In this embodiment, the parameters are a plurality of terms, including ambient temperature, outer disc temperature, evaporation temperature, and fluid line temperature.
In this embodiment, the detection module includes ambient temperature sensor, outer dish temperature sensor, low pressure sensor and liquid pipe temperature sensor, ambient temperature sensor is used for detecting ambient temperature, outer dish temperature sensor is used for detecting outer dish temperature, low pressure sensor is used for detecting low-pressure, according to the low-pressure that detects, acquires corresponding evaporating temperature from figure 3, liquid pipe temperature sensor is used for detecting the liquid pipe temperature.
In this embodiment, the controller is also used to record the time since the last defrost was completed.
In this embodiment, the controller adopts the main control board, the main control board with low pressure sensor ambient temperature sensor outer dish temperature sensor with liquid pipe temperature sensor electric connection.
Example three:
the embodiment provides a heat pump unit, which comprises the defrosting control device in the second embodiment.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A defrost control method, comprising the steps of:
step A: after a shutdown signal is received, 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, otherwise, executing the step G;
and B: acquiring time from the end of last defrosting and judging whether the time from the end of last defrosting is larger than or equal to a seventh threshold, if so, executing the step C, and if not, executing the step G;
and C: detecting the temperature of an outer disc and judging whether the difference value of the ambient temperature and the temperature of the outer disc is larger than or equal to a second threshold value or not, if so, executing a step D, otherwise, acquiring the evaporation temperature and judging whether the difference value of the ambient temperature and the evaporation temperature is larger than or equal to a third threshold value or not, if so, executing the step D, otherwise, executing the step G;
step D: judging whether the evaporation temperature is less than or equal to a fourth threshold value, if so, executing a step E, otherwise, judging whether the temperature of the outer disc is less than or equal to a fifth threshold value, if so, executing the step E, and if not, executing a step G;
step E: detecting the temperature of the liquid pipe and judging whether the temperature of the liquid pipe is larger than or equal to a sixth threshold value or not, if so, executing a step F, and otherwise, executing a step G;
step F: controlling the heat pump unit to enter a defrosting mode, and executing the step G after the defrosting mode is finished;
step G: controlling a heat pump unit to enter a shutdown program;
wherein the value range of the first threshold is-5 to 5 ℃;
the value range of the second threshold is 5 to 15 ℃;
the value range of the third threshold is 5 to 20 ℃;
the value range of the fourth threshold is-10 to-2 ℃;
the value range of the fifth threshold is-5 to 2 ℃;
the value range of the sixth threshold is 5 to 20 ℃;
the value range of the seventh threshold is 10 to 50min.
2. Defrost control according to claim 1, characterized in that the second threshold value is associated with the ambient temperature, the higher the ambient temperature, the larger the second threshold value takes within the range of values.
3. The defrost control method of claim 1 wherein the third threshold is associated with an ambient temperature, the higher the ambient temperature, the greater the third threshold is taken within a range of values.
4. The defrost control method of claim 1, wherein the method of obtaining the evaporation temperature comprises:
detecting low pressure;
and acquiring the 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 being configured to detect a parameter, the controller being configured to perform the defrost control method of any of claims 1-4.
6. Defrost control apparatus as in claim 5 wherein the parameters are a plurality of items including ambient temperature, outer pan temperature, evaporation temperature and liquid line temperature.
7. The defrost control device of claim 6, wherein the detection module includes:
an ambient temperature sensor for detecting an ambient temperature;
the outer disc temperature sensor is used for detecting the temperature of the outer disc;
the low-pressure sensor is used for detecting low-pressure and acquiring corresponding evaporation temperature according to the detected low-pressure;
and the liquid pipe temperature sensor is used for detecting the temperature of the liquid pipe.
8. Defrost control apparatus according to claim 5, wherein the controller is further adapted to record the time since the last defrost event.
9. The defrost control device of claim 7 wherein the controller employs a main control board electrically connected to the low pressure sensor, the ambient temperature sensor, the outer pan temperature sensor, and the liquid tube temperature sensor.
10. A heat pump unit comprising a defrost control apparatus as claimed in 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 true CN115654777A (en) | 2023-01-31 |
| CN115654777B CN115654777B (en) | 2023-12-15 |
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| CN114234486A (en) * | 2021-12-20 | 2022-03-25 | 广东芬尼克兹节能设备有限公司 | Heat pump defrosting control method and device, computer equipment and storage medium |
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2022
- 2022-11-09 CN CN202211396391.4A patent/CN115654777B/en active Active
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| US4882908A (en) * | 1987-07-17 | 1989-11-28 | Ranco Incorporated | Demand defrost control method and apparatus |
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