CN115479355A - Deicing method and device for air conditioner heat exchanger and air conditioner - Google Patents
Deicing method and device for air conditioner heat exchanger and air conditioner Download PDFInfo
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- CN115479355A CN115479355A CN202211202816.3A CN202211202816A CN115479355A CN 115479355 A CN115479355 A CN 115479355A CN 202211202816 A CN202211202816 A CN 202211202816A CN 115479355 A CN115479355 A CN 115479355A
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- 238000004891 communication Methods 0.000 claims description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- 230000008569 process Effects 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 238000009423 ventilation Methods 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
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- 230000000694 effects Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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Abstract
The application provides a deicing method and a deicing device for an air conditioner heat exchanger and an air conditioner, wherein the heat exchanger comprises a cold edge inlet and a cold edge outlet, and a hot path valve is communicated with the cold edge inlet, and the deicing method is characterized by comprising the following steps: acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference of a cold side inlet and a cold side outlet; under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, the hot path valve is opened at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, and the second preset pressure threshold value is less than the first preset pressure threshold value; and under the condition that the pressure difference of the heat exchanger is less than a second preset pressure threshold value, the hot path valve is closed at a preset closing speed until the opening degree of the hot path valve is 0, so that the problem of icing and blocking of the heat exchanger at the outlet of the turbine in the wet weather in the prior art is solved.
Description
Technical Field
The application relates to the technical field of air conditioner deicing, in particular to a deicing method and device for an air conditioner heat exchanger, a computer readable storage medium and an air conditioner.
Background
The air can be depressurized and cooled in the turbine, and because the air contains a small amount of water vapor, when the temperature is reduced, the water vapor can be condensed into water drops when the air temperature is higher than 0 ℃, and the water vapor can be condensed into ice crystals when the air temperature is lower than 0 ℃. Under general working conditions, the outlet of the turbine and the inlet of the cold edge of the heat exchanger are far lower than 0 ℃, water vapor in the air is changed into ice crystals, the ice crystals are gathered on the windward surface of the inlet of the cold edge of the heat exchanger to form an ice layer, the ice layer gradually grows to cover the ventilation surface of the cold edge of the heat exchanger, the resistance of the heat exchanger is increased, the air flow passing through the heat exchanger is reduced, and the working conditions are deteriorated. Generally, a heating cavity is arranged on a heat exchanger to reduce the icing phenomenon, but when air is very humid and ice crystals at the outlet of a turbine are too much, the ice crystals are seriously accumulated at the air inlet of the heat exchanger to cause the blockage of the heat exchanger, and a hot path valve is needed to melt ice at the cold edge inlet of the heat exchanger.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The main purpose of the present application is to provide a deicing method and apparatus for a heat exchanger of an air conditioner, a computer readable storage medium, and an air conditioner, so as to solve the problem of icing and blocking of the heat exchanger at the outlet of a turbine in humid weather in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a deicing method for an air conditioner heat exchanger, the heat exchanger including a cold side inlet and a cold side outlet, a hot path valve communicating with the cold side inlet, the deicing method including: acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet; under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value; and under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0.
Optionally, in a case that the heat exchanger pressure difference is greater than a first predetermined pressure threshold, opening the thermal path shutter at a predetermined opening speed includes: a first sending step, sending an opening pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than the first preset pressure threshold value, wherein the frequency of the opening pulse signal is a pulse frequency corresponding to a preset opening speed; a first acquisition step of acquiring the heat exchanger pressure difference; a second sending step, under the condition that the pressure difference of the heat exchanger is greater than or equal to a second preset pressure threshold value, sending the opening pulse signal with the preset time length to the thermal circuit valve; and repeating the second sending step and the first acquiring step at least once in sequence until the pressure difference of the heat exchanger is less than the second preset pressure threshold.
Optionally, the frequency of the opening pulse signal is 500 times the difference between the current heat exchanger pressure difference and the second predetermined pressure threshold.
Optionally, before the first sending step, the deicing method further comprises: acquiring the opening degree of the hot path valve; and under the condition that the opening degree of the hot path valve is the maximum opening degree, acquiring the pressure difference of the heat exchanger in real time until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
Optionally, in a case that the heat exchanger pressure difference is smaller than the second predetermined pressure threshold, closing the thermal circuit valve at a predetermined closing speed until the opening degree of the thermal circuit valve is 0 includes: a third sending step, sending a closing pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, wherein the frequency of the closing pulse signal is the pulse frequency corresponding to the preset closing speed; a second obtaining step of obtaining the opening degree of the thermal circuit valve; a fourth sending step of sending the closing pulse signal with the preset time length to the thermal circuit valve under the condition that the opening of the thermal circuit valve is larger than 0; and repeating the fourth sending step and the second obtaining step at least once in sequence until the opening degree of the hot-circuit valve is 0.
Optionally, the frequency of the close pulse signal has a value range of 800Hz to 1200Hz.
Optionally, a value range of the first predetermined pressure threshold is 4kPa to 6kPa, and a value range of the second predetermined pressure threshold is 1kPa to 3kPa.
According to another aspect of the embodiments of the present invention, there is also provided a deicing device for an air conditioner heat exchanger, the heat exchanger including a cold side inlet and a cold side outlet, and a hot path valve communicating with the cold side inlet, the deicing device including: the first acquisition unit is used for acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet; the first control unit is used for opening the thermal circuit valve at a preset opening speed under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value until the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, and the second preset pressure threshold value is smaller than the first preset pressure threshold value; and the second control unit is used for closing the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0 under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
According to still another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein when the program is executed by a processor, the processor performs any one of the processing methods.
According to still another aspect of the embodiments of the present invention, there is also provided an air conditioner including: a heat exchanger comprising a cold side inlet and a cold side outlet, a hot path valve in communication with the cold side inlet, one or more processors, a memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of deicing.
In an embodiment of the present invention, in the method for removing ice from an air conditioner heat exchanger, first, a pressure difference of the heat exchanger is obtained, where the pressure difference of the heat exchanger is a pressure difference between the cold side inlet and the cold side outlet; then, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value; and finally, under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the hot-circuit valve at a preset closing speed until the opening degree of the hot-circuit valve is 0. The method comprises the steps of detecting the pressure difference between a cold side inlet and a cold side outlet to obtain the pressure difference of a heat exchanger, determining that ice crystals are gathered on the windward side of the cold side inlet of a condenser to form an ice layer under the condition that the pressure difference of the heat exchanger is larger than a first preset pressure threshold value, gradually increasing the ice layer to cover the ventilation surface of the cold side of the heat exchanger, increasing the resistance of the heat exchanger, opening a hot path valve at a preset opening speed, melting ice by high-temperature gas passing through a hot path, determining that melting ice is finished under the condition that the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, and closing the hot path valve at a preset closing speed until the opening degree of the hot path valve is 0, so that the problem of icing and blocking of the heat exchanger at the turbine outlet in the prior art in humid weather is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 illustrates a partial schematic view of an air conditioner according to an embodiment of the present application;
FIG. 2 illustrates a flow diagram of a method of deicing an air conditioner heat exchanger according to an embodiment of the present application;
FIG. 3 shows a schematic view of a de-icing apparatus for an air conditioning heat exchanger according to an embodiment of the present application;
fig. 4 shows a flow chart of a method of deicing an air conditioner heat exchanger according to another embodiment of the present application.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As mentioned in the background of the invention, in order to solve the above problems, in the prior art, due to the blockage caused by the freezing of the heat exchanger at the outlet of the turbine in the wet weather, in an exemplary embodiment of the present application, a method and an apparatus for deicing the heat exchanger of an air conditioner, a computer readable storage medium, and an air conditioner are provided.
According to the embodiment of the application, a deicing method of an air conditioner heat exchanger is provided, as shown in fig. 1, a turbine is connected with the heat exchanger, cold air at an outlet of the turbine enters a cold side of the heat exchanger for heat exchange, a tee joint is arranged at the outlet of the turbine, a hot air pipeline is connected with a hot path valve, the valve is connected with the tee joint at the outlet of the turbine, the valve can feed back fully-closed or fully-opened position information to a controller, pressure guiding pipes are arranged at an inlet and an outlet of the cold side of the heat exchanger, the two pressure guiding pipes are connected with two side detection interfaces of a pressure difference sensor, the pressure difference sensor detects the pressure in front of and behind the heat exchanger, the pressure difference sensor transmits the detected pressure difference of the heat exchanger to the controller, the controller receives the pressure difference of the heat exchanger, and outputs a control signal of the hot path valve after processing.
Fig. 2 is a flowchart of a deicing method of an air conditioner heat exchanger according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:
step S101, acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet;
step S102, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value;
and step S103, closing the thermal path valve at a predetermined closing speed until the opening of the thermal path valve is 0, when the heat exchanger pressure difference is smaller than the second predetermined pressure threshold.
In the deicing method of the air conditioner heat exchanger, firstly, the pressure difference of the heat exchanger is obtained, and the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet; then, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value; and finally, under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the hot-circuit valve at a preset closing speed until the opening degree of the hot-circuit valve is 0. The method comprises the steps of detecting the pressure difference between the cold side inlet and the cold side outlet to obtain the pressure difference of a heat exchanger, determining that ice crystals are gathered on the windward surface of the cold side inlet of the condenser to form an ice layer under the condition that the pressure difference of the heat exchanger is larger than a first preset pressure threshold value, gradually increasing the ice layer to cover the ventilation surface of the cold side of the heat exchanger, increasing the resistance of the heat exchanger, opening the hot path valve at a preset opening speed to melt ice through high-temperature gas of a hot path, determining that the ice melting is finished under the condition that the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, and closing the hot path valve at a preset closing speed until the opening degree of the hot path valve is 0, so that the problem of icing and blocking of the heat exchanger at the turbine outlet in the wet weather in the prior art is solved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Optionally, the present invention does not limit the specific process of opening the thermal path valve at a predetermined opening speed when the pressure difference of the heat exchanger is greater than the first predetermined pressure threshold, and any feasible manner falls within the protection scope of the present invention.
For example, in an alternative embodiment, the step S102 includes:
a first sending step, sending an opening pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than the first preset pressure threshold value, wherein the frequency of the opening pulse signal is a pulse frequency corresponding to a preset opening speed;
a first acquiring step of acquiring the pressure difference of the heat exchanger;
a second sending step of sending the opening pulse signal of the preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than or equal to the second preset pressure threshold value;
and repeating the second sending step and the first acquiring step at least once in sequence until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold.
In the above embodiment, the thermal path valve is opened at the predetermined opening speed by sending an opening pulse signal with a pulse frequency corresponding to the predetermined opening speed to the thermal path valve, the opening process lasts for a predetermined time, for example, 0.1s, then the pressure difference of the heat exchanger is obtained again, and the process is repeated for multiple times until the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, so that the opening degree of the thermal path valve is timely and accurately controlled according to the pressure difference of the heat exchanger, and therefore, it is avoided that the pressure difference of the heat exchanger is too fast, which causes control delay, for example, the control delay is directly adjusted to the maximum opening degree, and the deicing cannot be timely closed after being ended, which causes energy waste.
Further, in an alternative embodiment, the frequency of the opening pulse signal is 500 times the difference between the current heat exchanger pressure difference and the second predetermined pressure threshold.
In the above embodiment, the frequency of the opening pulse signal is (p-2)/2 × 1000hz, so that the magnitude of the opening speed can be controlled according to the magnitude of the pressure difference of the heat exchanger, the larger the pressure difference of the heat exchanger is, the more serious the blockage is, and the faster the opening speed of the thermal path valve is, so as to melt ice in time and avoid long-time blockage.
In order to further simplify the flow of the deicing method, in an alternative embodiment, before the first sending step, the deicing method further includes:
acquiring the opening degree of the thermal path valve;
and under the condition that the opening degree of the thermal path valve is the maximum opening degree, acquiring the pressure difference of the heat exchanger in real time until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
In the above embodiment, when deicing starts, the opening degree of the thermal circuit valve is directly obtained, and if the thermal circuit valve is fully opened, it is not necessary to send an opening pulse signal, and the pressure difference of the heat exchanger is obtained in real time until the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, so that the deicing process is simplified, and the efficiency is improved.
Optionally, the present invention does not limit the specific process of closing the thermal path valve at the predetermined closing speed until the opening degree of the thermal path valve is 0 when the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, and any feasible manner is within the protection scope of the present invention.
For example, in an alternative embodiment, the step S103 includes:
a third sending step, sending a closing pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold, wherein the frequency of the closing pulse signal is a pulse frequency corresponding to the preset closing speed;
a second obtaining step of obtaining the opening degree of the hot-path valve;
a fourth sending step of sending a closing pulse signal of the predetermined time length to the thermal path valve when the opening degree of the thermal path valve is greater than 0;
and repeating the fourth sending step and the second obtaining step at least once in sequence until the opening degree of the hot-circuit valve is 0.
In the above embodiment, by sending a close pulse signal with a pulse frequency corresponding to a predetermined close speed to the hot path valve, the hot path valve is closed at a close/open speed, each close process lasts for a predetermined time, for example, 0.1s, then the heat exchanger pressure difference is obtained again, and the opening of the hot path valve is repeatedly set to 0 for many times, so that the opening of the hot path valve is accurately controlled in time according to the heat exchanger pressure difference, thereby preventing the heat exchanger pressure difference from changing too fast, which causes a control delay, for example, the control delay is directly adjusted to a minimum opening, and the deicing starts to be unable to be opened in time, which causes a low deicing efficiency.
Further, in an optional embodiment, a frequency of the shutdown pulse signal has a range of 800Hz to 1200Hz.
In the above embodiment, the frequency of the close pulse signal is such that the close speed is in a suitable interval, which does not cause damage to the valve too fast and also does not cause untimely adjustment too slow, and preferably, the close pulse signal is 1000Hz.
Further, in an optional embodiment, the first predetermined pressure threshold value ranges from 4kPa to 6kPa, and the second predetermined pressure threshold value ranges from 1kPa to 3kPa.
In the above embodiment, the first predetermined pressure threshold and the second predetermined pressure threshold are set in the above ranges so as to effectively remove ice in time, and preferably, the first predetermined pressure threshold is 5kPa, and the second predetermined pressure threshold is 2kPa, which may be adjusted by a person skilled in the art according to actual situations.
The embodiment of the application also provides a deicing device of the air-conditioning heat exchanger, and it needs to be explained that the deicing device of the air-conditioning heat exchanger in the embodiment of the application can be used for executing the deicing method for the air-conditioning heat exchanger provided in the embodiment of the application. The deicing device of the air conditioner heat exchanger provided by the embodiment of the application is introduced below, the heat exchanger comprises a cold edge inlet and a cold edge outlet, and a hot path valve is communicated with the cold edge inlet.
Fig. 3 is a schematic view of a deicing device for an air conditioner heat exchanger according to an embodiment of the present application. As shown in fig. 3, the apparatus includes:
a first obtaining unit 10, configured to obtain a pressure difference of a heat exchanger, where the pressure difference of the heat exchanger is a pressure difference between the cold side inlet and the cold side outlet;
a first control unit 20, configured to open the thermal path valve at a predetermined opening speed when the heat exchanger pressure difference is greater than a first predetermined pressure threshold value, until the heat exchanger pressure difference is smaller than a second predetermined pressure threshold value, where the second predetermined pressure threshold value is smaller than the first predetermined pressure threshold value;
and a second control unit 30, configured to close the thermal path valve at a predetermined closing speed until the opening of the thermal path valve is 0, when the heat exchanger pressure difference is smaller than the second predetermined pressure threshold value.
In the deicing device of the air conditioner heat exchanger, an acquisition unit acquires the pressure difference of the heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold edge inlet and the cold edge outlet; the first control unit opens the thermal circuit valve at a preset opening speed under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value until the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, wherein the second preset pressure threshold value is smaller than the first preset pressure threshold value; and the second control unit closes the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0 under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value. The device obtains the pressure difference of the heat exchanger by detecting the pressure difference between the cold side inlet and the cold side outlet, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, ice crystals are determined to be gathered on the windward side of the cold side inlet of the condenser to form an ice layer, the ice layer gradually grows to cover the ventilation surface of the cold side of the heat exchanger, the resistance of the heat exchanger is increased, the hot path valve is opened at a preset opening speed, the high-temperature gas passing through the hot path is used for deicing, under the condition that the pressure difference of the heat exchanger is less than a second preset pressure threshold value, the deicing is determined to be completed, the hot path valve is closed at a preset closing speed until the opening degree of the hot path valve is 0, and therefore the problem that the heat exchanger at the turbine outlet is blocked due to icing in humid weather in the prior art is solved.
Optionally, the present invention does not limit the specific process of opening the thermal path valve at a predetermined opening speed when the pressure difference of the heat exchanger is greater than the first predetermined pressure threshold, and any feasible manner falls within the protection scope of the present invention.
For example, in an alternative embodiment, the first control unit includes:
the first sending module is used for executing a first sending step, sending an opening pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than the first preset pressure threshold value, wherein the frequency of the opening pulse signal is a pulse frequency corresponding to a preset opening speed;
the first acquisition module is used for executing a first acquisition step and acquiring the pressure difference of the heat exchanger;
the second sending module is used for executing a second sending step, and sending the opening pulse signal with the preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than or equal to the second preset pressure threshold value;
and the first repeating module is used for repeating the second sending step and the first obtaining step at least once in sequence until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
In the above embodiment, the thermal path valve is opened at the predetermined opening speed by sending an opening pulse signal with a pulse frequency corresponding to the predetermined opening speed to the thermal path valve, the opening process lasts for a predetermined time, for example, 0.1s, then the pressure difference of the heat exchanger is obtained again, and the process is repeated for multiple times until the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, so that the opening degree of the thermal path valve is timely and accurately controlled according to the pressure difference of the heat exchanger, and therefore, it is avoided that the pressure difference of the heat exchanger is too fast, which causes control delay, for example, the control delay is directly adjusted to the maximum opening degree, and the deicing cannot be timely closed after being ended, which causes energy waste.
Further, in an alternative embodiment, the frequency of the opening pulse signal is 500 times the difference between the current heat exchanger pressure difference and the second predetermined pressure threshold.
In the above embodiment, the frequency of the opening pulse signal is (p-2)/2 × 1000hz, so that the opening speed can be controlled according to the magnitude of the pressure difference of the heat exchanger, the larger the pressure difference of the heat exchanger is, the more serious the blockage is, and the faster the opening speed of the thermal path valve is, so as to melt ice in time and avoid long-time blockage.
In order to further simplify the flow of the deicing method, in an alternative embodiment, the deicing device further includes a second obtaining unit, where the second obtaining unit includes:
a second obtaining module, configured to obtain an opening degree of the thermal path valve before the first sending step;
and the third acquisition module is used for acquiring the pressure difference of the heat exchanger in real time under the condition that the opening degree of the thermal path valve is the maximum opening degree until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
In the above embodiment, when deicing starts, the opening degree of the thermal circuit valve is directly obtained, and if the thermal circuit valve is fully opened, it is not necessary to send an opening pulse signal, and the pressure difference of the heat exchanger is obtained in real time until the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, so that the deicing process is simplified, and the efficiency is improved.
Optionally, the present invention does not limit the specific process of closing the thermal path valve at the predetermined closing speed until the opening degree of the thermal path valve is 0 when the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, and any feasible manner is within the protection scope of the present invention.
For example, in an alternative embodiment, the second control unit includes:
a third sending module, configured to execute a third sending step, send a close pulse signal of a predetermined duration to the thermal path valve when the pressure difference of the heat exchanger is smaller than the second predetermined pressure threshold, where a frequency of the close pulse signal is a pulse frequency corresponding to the predetermined close speed;
the fourth acquisition module is used for executing the second acquisition step and acquiring the opening degree of the hot-path valve;
a fourth sending module, configured to execute a fourth sending step, and send a close pulse signal of the predetermined duration to the hot-path valve when the opening of the hot-path valve is greater than 0;
and the second repeating module is used for repeating the fourth sending step and the second obtaining step at least once in sequence until the opening degree of the thermal circuit valve is 0.
In the above embodiment, by sending a close pulse signal with a pulse frequency corresponding to a predetermined close speed to the thermal path valve, the thermal path valve is closed at a close/open speed, each close process lasts for a predetermined time, for example, 0.1s, then the heat exchanger pressure difference is obtained again, and the opening degree of the thermal path valve is repeatedly set to 0 for multiple times, so that the opening degree of the thermal path valve is accurately controlled in time according to the heat exchanger pressure difference, thereby preventing the control delay caused by too fast change of the heat exchanger pressure difference, for example, direct adjustment to the minimum opening degree, and start of deicing which cannot be started in time, which results in low deicing efficiency.
Further, in an optional embodiment, the frequency of the close pulse signal ranges from 800Hz to 1200Hz.
In the above embodiment, the frequency of the close pulse signal is such that the close speed is in a suitable interval, which does not cause valve damage too fast and not cause untimely adjustment too slow, and preferably, the close pulse signal is 1000Hz.
Further, in an optional embodiment, the first predetermined pressure threshold value ranges from 4kPa to 6kPa, and the second predetermined pressure threshold value ranges from 1kPa to 3kPa.
In the above embodiment, the first predetermined pressure threshold and the second predetermined pressure threshold are set in the above ranges so as to effectively remove ice in time, and preferably, the first predetermined pressure threshold is 5kPa, and the second predetermined pressure threshold is 2kPa, which may be adjusted by a person skilled in the art according to actual situations.
The embodiment of the present application further provides an air conditioner, including: a heat exchanger comprising a cold side inlet and a cold side outlet, a hot path valve in communication with the cold side inlet, one or more processors, a memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the above-described de-icing methods.
Acquiring the pressure difference of a heat exchanger in the air conditioner, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet; under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value; and closing the thermal path valve at a preset closing speed until the opening degree of the thermal path valve is 0 under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value. The air conditioner obtains the pressure difference of a heat exchanger by detecting the pressure difference between the cold side inlet and the cold side outlet, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, ice crystals are determined to be gathered on the windward side of the cold side inlet of the condenser to form an ice layer, the ice layer gradually grows to cover the ventilation surface of the cold side of the heat exchanger, the resistance of the heat exchanger is increased, the hot path valve is opened at a preset opening speed, the high-temperature gas passing through the hot path is used for deicing, under the condition that the pressure difference of the heat exchanger is less than a second preset pressure threshold value, the deicing is determined to be completed, the hot path valve is closed at a preset closing speed until the opening degree of the hot path valve is 0, and therefore the problem that the heat exchanger at the turbine outlet is iced and blocked in humid weather in the prior art is solved.
In order to make the technical solutions of the present application more intuitively known to those skilled in the art, the following description is provided by specific examples.
Examples
A flowchart of a deicing method of an air conditioner heat exchanger according to the present embodiment is shown in fig. 4, and the method includes the following steps:
1) After receiving a resistance signal detected by the differential pressure sensor, the controller judges whether to enter a deicing mode if the pressure is less than 5kPa, and enters a step 2 if the pressure is more than or equal to 5 kPa);
2) Judging whether the position signal of the hot path valve is fully opened or not, if the position signal is fully opened, directly entering a step 3), and if the position signal is not fully opened, outputting an opening pulse signal of (p-2)/2 x 1000Hz of 0.1S to the hot path valve, and then entering the step 3);
3) Judging whether the pressure difference is less than 2kPa, if the pressure difference is more than or equal to 2kPa, returning to the step 2), and if the pressure difference is less than 2kPa, entering the step 4);
4) Outputting a closing pulse signal of 1000Hz for 0.1S to the hot-path valve, then judging whether the position signal of the hot-path valve is a full-off signal, exiting the deicing mode if the position signal is the full-off signal, and entering a step 4 if the position signal is not the full-off signal).
The deicing device of the air conditioner heat exchanger comprises a processor and a memory, the first acquisition unit, the first control unit, the second control unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one inner core can be arranged, and the problem of icing and blockage of a heat exchanger at the outlet of the turbine in wet weather in the prior art is solved by adjusting the parameters of the inner core.
The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), including at least one memory chip.
An embodiment of the present invention provides a computer-readable storage medium, on which a program is stored, which when executed by a processor implements the above-described method.
The embodiment of the invention provides a processor, which is used for running a program, wherein the method is executed when the program runs.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein when the processor executes the program, at least the following steps are realized:
step S101, acquiring a pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet;
step S102, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold, the thermal circuit valve is opened at a preset opening speed until the pressure difference of the heat exchanger is smaller than a second preset pressure threshold, and the second preset pressure threshold is smaller than the first preset pressure threshold;
and step S103, under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0.
The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:
step S101, acquiring a pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet;
step S102, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal circuit valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value;
and step S103, under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the hot-circuit valve at a preset closing speed until the opening degree of the hot-circuit valve is 0.
In the above embodiments of the present invention, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described in detail in a certain embodiment.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a computer-readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned computer-readable storage media comprise: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:
1) According to the deicing method of the air conditioner heat exchanger, firstly, the pressure difference of the heat exchanger is obtained, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet; then, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value; and finally, under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the hot-circuit valve at a preset closing speed until the opening degree of the hot-circuit valve is 0. The method comprises the steps of detecting the pressure difference between the cold side inlet and the cold side outlet to obtain the pressure difference of a heat exchanger, determining that ice crystals are gathered on the windward surface of the cold side inlet of the condenser to form an ice layer under the condition that the pressure difference of the heat exchanger is larger than a first preset pressure threshold value, gradually increasing the ice layer to cover the ventilation surface of the cold side of the heat exchanger, increasing the resistance of the heat exchanger, opening the hot path valve at a preset opening speed to melt ice through high-temperature gas of a hot path, determining that the ice melting is finished under the condition that the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, and closing the hot path valve at a preset closing speed until the opening degree of the hot path valve is 0, so that the problem of icing and blocking of the heat exchanger at the turbine outlet in the wet weather in the prior art is solved.
2) In the deicing device of the air conditioner heat exchanger, the acquisition unit acquires the pressure difference of the heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold edge inlet and the cold edge outlet; the first control unit opens the thermal circuit valve at a preset opening speed under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value until the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, wherein the second preset pressure threshold value is smaller than the first preset pressure threshold value; and the second control unit closes the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0 under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value. The device obtains the pressure difference of the heat exchanger by detecting the pressure difference between the cold side inlet and the cold side outlet, under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, ice crystals are determined to be gathered on the windward side of the cold side inlet of the condenser to form an ice layer, the ice layer gradually grows to cover the ventilation surface of the cold side of the heat exchanger, the resistance of the heat exchanger is increased, the hot path valve is opened at a preset opening speed, the high-temperature gas passing through the hot path is used for deicing, under the condition that the pressure difference of the heat exchanger is less than a second preset pressure threshold value, the deicing is determined to be completed, the hot path valve is closed at a preset closing speed until the opening degree of the hot path valve is 0, and therefore the problem that the heat exchanger at the turbine outlet is blocked due to icing in humid weather in the prior art is solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A deicing method of an air conditioner heat exchanger, wherein the heat exchanger comprises a cold edge inlet and a cold edge outlet, and a hot path valve is communicated with the cold edge inlet, and the deicing method is characterized by comprising the following steps:
acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet;
under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value, opening the thermal path valve at a preset opening speed until the pressure difference of the heat exchanger is less than a second preset pressure threshold value, wherein the second preset pressure threshold value is less than the first preset pressure threshold value;
and under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value, closing the hot-circuit valve at a preset closing speed until the opening degree of the hot-circuit valve is 0.
2. Method according to claim 1, wherein opening said thermal circuit shutter at a predetermined opening speed in the event of a pressure difference of said heat exchanger greater than a first predetermined pressure threshold value comprises:
a first sending step, sending an opening pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than the first preset pressure threshold value, wherein the frequency of the opening pulse signal is a pulse frequency corresponding to a preset opening speed;
a first acquiring step of acquiring the heat exchanger pressure difference;
a second sending step, sending the opening pulse signal with the preset duration to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is greater than or equal to a second preset pressure threshold value;
and repeating the second sending step and the first acquiring step at least once in sequence until the pressure difference of the heat exchanger is less than the second preset pressure threshold.
3. Deicing method according to claim 2, characterized in that the frequency of the opening pulse signal is 500 times the difference between the current heat exchanger pressure difference and the second predetermined pressure threshold value.
4. A deicing method in accordance with claim 2, wherein, before said first transmitting step, said deicing method further comprises:
acquiring the opening degree of the thermal circuit valve;
and under the condition that the opening degree of the hot path valve is the maximum opening degree, acquiring the pressure difference of the heat exchanger in real time until the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
5. Deicing method according to claim 1, wherein closing the thermal circuit shutter at a predetermined closing speed until the degree of opening of the thermal circuit shutter is 0 in a case where the heat exchanger pressure difference is smaller than the second predetermined pressure threshold value comprises:
a third sending step, sending a closing pulse signal with a preset time length to the thermal circuit valve under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold, wherein the frequency of the closing pulse signal is the pulse frequency corresponding to the preset closing speed;
a second obtaining step of obtaining the opening degree of the hot-circuit valve;
a fourth sending step of sending the closing pulse signal with the preset time length to the hot-circuit valve under the condition that the opening degree of the hot-circuit valve is larger than 0;
and repeating the fourth sending step and the second obtaining step at least once in sequence until the opening degree of the hot-circuit valve is 0.
6. Deicing method according to claim 5, characterized in that the frequency of the off-pulse signal ranges from 800Hz to 1200Hz.
7. Deicing method according to any one of claims 1 to 6, characterized in that said first predetermined pressure threshold value ranges from 4kPa to 6kPa and said second predetermined pressure threshold value ranges from 1kPa to 3kPa.
8. The utility model provides an air conditioner heat exchanger's defroster, heat exchanger include cold limit import and cold limit export, the hot circuit valve with cold limit import intercommunication, its characterized in that, defroster includes:
the first acquisition unit is used for acquiring the pressure difference of a heat exchanger, wherein the pressure difference of the heat exchanger is the pressure difference between the cold side inlet and the cold side outlet;
the first control unit is used for opening the thermal circuit valve at a preset opening speed under the condition that the pressure difference of the heat exchanger is greater than a first preset pressure threshold value until the pressure difference of the heat exchanger is smaller than a second preset pressure threshold value, and the second preset pressure threshold value is smaller than the first preset pressure threshold value;
and the second control unit is used for closing the thermal circuit valve at a preset closing speed until the opening degree of the thermal circuit valve is 0 under the condition that the pressure difference of the heat exchanger is smaller than the second preset pressure threshold value.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when executed by a processor, causes the processor to carry out the processing method of any one of claims 1 to 7.
10. An air conditioner, comprising: a heat exchanger comprising a cold side inlet and a cold side outlet, a hot path valve in communication with the cold side inlet, one or more processors, a memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing the method of deicing of any one of claims 1-7.
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