CN115164525A - Detection method for drying system, storage medium and drying system - Google Patents
Detection method for drying system, storage medium and drying system Download PDFInfo
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- CN115164525A CN115164525A CN202210744245.XA CN202210744245A CN115164525A CN 115164525 A CN115164525 A CN 115164525A CN 202210744245 A CN202210744245 A CN 202210744245A CN 115164525 A CN115164525 A CN 115164525A
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- 238000001035 drying Methods 0.000 title claims abstract description 96
- 238000001514 detection method Methods 0.000 title claims abstract description 49
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a detection method for a drying system, a storage medium and a drying system. The detection method comprises the following steps: detecting the suction pressure of a compressor of the drying system; comparing the suction pressure with a preset suction pressure interval; when the suction pressure falls into the preset suction pressure interval, detecting the real-time temperature of the outdoor motor, and determining the temperature difference between the real-time temperature and the starting temperature of the outdoor motor; comparing the temperature difference value with a preset temperature difference value; and judging whether the outdoor heat exchanger of the drying system is dirty or not based on the comparison result. The detection method for the drying system can accurately and conveniently detect whether the outdoor heat exchanger of the drying system is dirty or not.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a detection method for a drying system, a storage medium and the drying system.
Background
The drying system is a device combination for drying materials with high water content by utilizing heat energy. According to different heat energy generation forms, the drying system can be divided into various types such as an electric heating type, a gas type, a fuel oil type, a coal type and a heat pump type. Compared with the traditional fuel type drying system, the heat pump type drying system has the advantages of energy conservation, high efficiency, environmental friendliness, low operating cost and the like, so that the heat pump type drying system is widely applied to various fields of tobacco processing, grain storage, metallurgical chemical industry and the like.
A heat pump type drying system generally includes a compressor, a condenser, an expansion device, and an evaporator connected in series by refrigerant lines to form a refrigeration circuit for allowing a refrigerant (e.g., R34a, etc.) to circulate therethrough. When the heat pump type drying system is adopted to process tobacco arranged in the curing barn, the whole heat pump type drying system can be divided into an indoor unit adjacent to the curing barn and an outdoor unit far away from the curing barn. The indoor unit comprises a condenser (namely an indoor heat exchanger), an indoor fan and other components which are arranged in a heating chamber; the outdoor unit includes a compressor, an expansion device, an evaporator (i.e., an outdoor heat exchanger), an outdoor fan, and the like. In practice, it has been found that if a protective device such as a protective net is provided on the outdoor unit, rain and snow are likely to accumulate on the protective net and freeze once it encounters rain and snow weather. Due to the lack of an effective deicing device, the refrigerant in the evaporator is difficult to evaporate effectively, and the normal operation of the heat pump type drying system is greatly influenced.
In order to solve the above problems, it is currently common practice to expose most of the evaporator directly to the outside, so that even if rain or snow falls on the evaporator, the evaporator can be rapidly heated by using the high-temperature steam generated by the compressor. However, in order to save the transportation cost, the curing barn is usually arranged near the tobacco planting field, so that the surface of the evaporator exposed outside is easily adsorbed by impurities such as leaves, weeds and plastic bags outside to cause a dirty and blocked phenomenon, thereby affecting the normal use of the evaporator. The drying system in the prior art lacks effective detection means to judge whether the evaporator is dirty or not, only can rely on simple methods such as manual inspection and the like, and is very inconvenient.
Therefore, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the technical problem that a drying system in the prior art cannot accurately detect whether the outdoor heat exchanger is dirty or not, the invention provides a detection method for the drying system. The detection method comprises the following steps:
detecting the suction pressure of a compressor of the drying system;
comparing the suction pressure with a preset suction pressure interval;
when the suction pressure falls into the preset suction pressure interval, detecting the real-time temperature of the outdoor motor, and determining the temperature difference between the real-time temperature and the starting temperature of the outdoor motor;
comparing the temperature difference value with a preset temperature difference value;
and judging whether the outdoor heat exchanger of the drying system is dirty or not based on the comparison result.
In the detection method for a drying system of the present invention, a suction pressure of a compressor of the drying system is first detected. Then, the measured suction pressure is compared with a preset suction pressure interval. When the measured suction pressure falls into a preset suction pressure interval, the fact that the drying system is abnormal possibly at the moment is shown, and the risk of dirty blockage of the outdoor heat exchanger exists. Then, a real-time temperature of the outdoor motor is detected, and a temperature difference between the real-time temperature and a starting temperature of the outdoor motor is determined. It should be noted that the "temperature difference" herein is related not only to the load of the outdoor motor but also to the heat exchange efficiency around the outdoor motor. When the outdoor heat exchanger is dirty and blocked (for example, impurities such as leaves, weeds and plastic bags are adsorbed on the surface of the outdoor heat exchanger), the load of the outdoor motor is increased, the flow rate of air around the outdoor motor is reduced, and the heat generated when the outdoor motor rotates is increased continuously, namely the temperature difference is increased. The temperature difference is compared with a preset temperature difference. Based on the comparison result, whether the outdoor heat exchanger of the drying system is dirty or not can be conveniently judged. In addition, the detection method for the drying system can judge whether the outdoor heat exchanger is dirty or not more accurately by introducing two parameters of the suction pressure and the temperature of the outdoor motor, and improves the judgment accuracy.
In an optimal technical solution of the detection method for the drying system, when the temperature difference is greater than or equal to the preset temperature difference, it is determined that the outdoor heat exchanger is dirty and blocked. When the temperature difference is larger than or equal to the preset temperature difference, the temperature of the outdoor motor is increased greatly, and then the situation that the outdoor heat exchange is dirty and blocked is judged.
In an optimal technical solution of the detection method for the drying system, when the temperature difference is smaller than the preset temperature difference, it is determined that the outdoor heat exchanger is not dirty and blocked. When the temperature difference is smaller than the preset temperature difference, the temperature amplification of the outdoor motor is small, the change of the suction pressure of the compressor is possibly caused by other factors, and the outdoor heat exchanger is judged to be not dirty and blocked.
In the above preferred technical solution of the detection method for a drying system, when the temperature difference is smaller than the preset temperature difference, the real-time temperature is compared with a maximum temperature threshold;
when the real-time temperature is smaller than the maximum temperature threshold, judging that the outdoor heat exchanger is not dirty and blocked;
and when the real-time temperature is greater than or equal to the maximum temperature threshold, judging that the outdoor heat exchanger is dirty and blocked. In an alternative embodiment, when the temperature difference is smaller than the preset temperature difference, the real-time temperature is first compared with the maximum temperature threshold. When the real-time temperature is lower than the maximum temperature threshold, the temperature of the outdoor motor is not greatly increased, so that the outdoor heat exchanger is judged to be not dirty and blocked; when the real-time temperature is greater than or equal to the maximum temperature threshold, it is indicated that although the temperature of the outdoor motor is not increased greatly (does not exceed the preset temperature difference), the real-time temperature is already high, and the outdoor heat exchanger may be dirty and blocked, so that it is determined that the outdoor heat exchanger is dirty and blocked at the moment.
In an optimal technical solution of the above detection method for a drying system, after it is determined that the outdoor heat exchange is dirty, the detection method further includes:
and controlling the outdoor motor to reversely rotate at a first rotating speed. When the outdoor heat exchanger is judged to be dirty and blocked, the outdoor motor is controlled to rotate reversely at the first rotating speed, so that impurities adsorbed on the surface of the outdoor heat exchanger are blown away by air flow generated by an outdoor fan connected with the outdoor motor.
In a preferred technical solution of the above detection method for a drying system, after a first preset time period, the suction pressure of the compressor is detected again;
comparing the newly measured suction pressure with the preset suction pressure interval;
and when the suction pressure exceeds the preset suction pressure interval, controlling the outdoor motor to rotate positively at a second rotating speed. When the newly measured suction pressure exceeds the preset suction pressure interval, the drying system operates normally at the moment, impurities adsorbed on the surface of the outdoor heat exchanger are effectively blown away, and the outdoor motor is controlled to rotate positively at the second rotating speed to ensure that the outdoor heat exchanger has good heat exchange efficiency.
In a preferred technical solution of the above detection method for a drying system, when the suction pressure falls into the preset suction pressure interval, the outdoor motor is controlled to continue to rotate reversely at the first rotation speed;
after the first preset time period, detecting the suction pressure of the compressor again;
when the current suction pressure exceeds the preset suction pressure interval, controlling the outdoor motor to rotate positively at the second rotating speed; and is
When the current suction pressure falls into the preset suction pressure interval, the outdoor motor is controlled to stop, and a fault alarm is sent out. And when the newly measured suction pressure still falls into the preset suction pressure interval, which indicates that the outdoor heat exchanger still has filth blockage, controlling the outdoor motor to continuously rotate in the reverse direction at the first rotating speed, so as to continuously clean impurities adsorbed on the surface of the outdoor heat exchanger. And after the first preset time period, the suction pressure of the compressor is detected again. When the current suction pressure exceeds the preset suction pressure interval, which indicates that impurities adsorbed on the surface of the outdoor heat exchanger are effectively blown away, the outdoor motor is controlled to positively rotate at the second rotating speed so as to ensure that the outdoor heat exchanger has good heat exchange efficiency. In addition, when the current suction pressure still falls into the preset suction pressure interval, the situation that impurities adsorbed on the surface of the outdoor heat exchanger cannot be effectively cleaned by adopting the reverse rotation of the outdoor motor is explained, the outdoor motor is controlled to stop, and a fault alarm is sent out, so that a user is reminded to adopt other means to clean the impurities in time.
In a preferred technical solution of the above detection method for a drying system, the preset suction pressure interval is greater than or equal to a preset lowest suction pressure and less than or equal to a product of the preset lowest suction pressure and a proportionality coefficient,
wherein the range of the proportionality coefficient is 1.2-1.3. Through the arrangement, the preset air suction pressure interval has a moderate value range.
In order to solve the technical problem that a drying system in the prior art cannot accurately detect whether the outdoor heat exchanger is dirty or not, the invention provides a storage medium. The storage medium is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and executed by a processor to perform the detection method for a drying system as set forth in any one of the above. Through the arrangement, the storage medium can conveniently execute the detection method for the drying system.
The invention provides a drying system, which aims to solve the technical problem that in the prior art, the drying system cannot accurately detect whether an outdoor heat exchanger is dirty or not. The drying system comprises the storage medium described above. By adopting the storage medium, the drying system can automatically execute the detection method for the drying system, so that whether the outdoor heat exchanger is dirty or not is accurately and conveniently detected, and the automation degree and precision of detection are improved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of an embodiment of a drying system of the present invention;
fig. 2 is a schematic structural view of an embodiment of an outdoor unit in the drying system of the present invention;
FIG. 3 is a schematic flow chart of a detection method for a drying system according to the present invention;
FIG. 4 is a schematic flow chart diagram illustrating a first embodiment of a detection method for a drying system according to the present invention;
fig. 5 is a flowchart illustrating a second embodiment of a detection method for a drying system according to the present invention.
List of reference numerals:
1. a drying system; 10. an indoor unit; 11. a heating chamber; 12. an indoor heat exchanger; 13. an indoor fan; 14. a fresh air port; 15. a moisture removal port; 16. a refrigerant pipeline; 20. an outdoor unit; 21. a housing; 211. a front wall; 2111. air holes are formed; 212. a top wall; 2121. a top grid; 213. a left side wall; 2131. an exposed area; 22. a pressure gauge; 23. an outdoor heat exchanger; 24. an outdoor fan; 2. and (4) curing barn.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first" and "second" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "disposed," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be directly connected or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the technical problem that a drying system in the prior art cannot accurately detect whether an outdoor heat exchanger is dirty or not, the invention provides a detection method for the drying system 1.
The detection method comprises the following steps:
detecting the suction pressure of a compressor of the drying system 1 (step S1);
comparing the suction pressure with a preset suction pressure interval (step S2);
when the suction pressure falls into a preset suction pressure interval, detecting the real-time temperature of the outdoor motor, and determining the temperature difference between the real-time temperature and the starting temperature of the outdoor motor (step S3);
comparing the temperature difference value with a preset temperature difference value (step S3);
it is judged whether or not the outdoor heat exchanger 23 of the drying system 1 is dirty based on the comparison result (step S4).
Fig. 1 is a schematic structural view of an embodiment of a drying system of the present invention; fig. 2 is a schematic structural view of an embodiment of an outdoor unit in the drying system of the present invention. As shown in fig. 1 and 2, in one or more embodiments, the drying system 1 of the present invention includes an indoor unit 10 and an outdoor unit 20. The indoor unit 10 includes a heating chamber 11 adjacent to the curing barn 2. The curing barn 2 is used for placing articles to be dried. Items to be dried include, but are not limited to, tobacco, corn, rice, wheat. An indoor heat exchanger 12 is provided inside the heating chamber 11. The indoor heat exchanger 12 may be, but is not limited to, a finned coil heat exchanger, a plate heat exchanger, and the like. An indoor fan 13 is provided above the indoor heat exchanger 12. When the indoor fan 13 is controlled to rotate, an air flow flowing in the heating chamber 11 is generated. The air stream is heated as it flows over the surfaces of the indoor heat exchanger 12 (acting as a condenser) to produce drying air for drying the items to be dried. Air inlets and air outlets (not shown) spaced apart from each other are further provided between the heating chamber 11 and the curing barn 2 so that air communication is formed between the heating chamber 11 and the curing barn 2 to achieve recycling of the drying air. In addition, a fresh air opening 14 and a moisture exhaust opening 15 which can be controlled to open and close and are spaced from each other are arranged on the heating chamber 11, so that when the fresh air opening 14 and the moisture exhaust opening 15 are all opened, fresh air (or called as "fresh air") of the external environment is sucked into the heating chamber 11 and then enters the baking room 2 from the inlet opening. The introduction of fresh air can drive the damp and hot air in the baking room 2 to be discharged from the moisture discharging port 15, so as to prevent the articles to be treated from being stuffy due to overhigh humidity in the baking room 2.
As shown in fig. 2, in one or more embodiments, the outdoor unit 20 includes a casing 21, an outdoor heat exchanger 23 disposed in the casing 21, an outdoor fan 24, and the like. The housing 21 has a front wall 211, a left side wall 213, a rear wall (not shown), a right side wall (not shown), and a top wall 212 connected in this order to form a substantially rectangular parallelepiped shape. The front wall 211 extends substantially in a vertical direction. In one or more embodiments, 9 ventilation holes 2111 are provided on the right side of the front wall 211, spaced apart in the vertical direction. Alternatively, the number of the ventilation holes 2111 may be set to other suitable numbers, such as 8, 10, etc., more or less than 9. In one or more embodiments, a generally rectangular exposed area 2131 is provided on the left side of the left sidewall 213. Alternatively, the exposed area 2131 may be provided in a circular, trapezoidal, or other suitable shape. A generally rectangular exposed area (not shown) is also provided on each of the rear and right side walls. With the above arrangement, most of the outdoor heat exchanger 23 disposed inside the casing 21 is exposed to the outside, so as to prevent rain and snow from accumulating on the casing 21 to freeze and affecting the performance of the outdoor heat exchanger 23. In other words, even if rain or snow falls on the outdoor heat exchanger 23, the drying system 1 may heat the outdoor heat exchanger 23 to remove ice by using high-temperature steam generated from a compressor (not shown). In one or more embodiments, the compressor is a fixed frequency compressor to reduce component costs. The compressor may be, but is not limited to, a screw compressor, a rotary compressor, a scroll compressor, or a centrifugal compressor. In one or more embodiments, the compressor includes 2 compressors in parallel with each other. The 2 compressors are configured to be started and stopped alternately so as to prolong the service life of the single compressor; the 2 compressors can also be turned on simultaneously to meet the demand for a large heating capacity. In one or more embodiments, 4 pressure gauges 22 spaced apart from each other in the vertical direction are provided on the right side of the left sidewall 213. Each pressure gauge 22 is used to indicate the discharge pressure or suction pressure of the corresponding compressor, respectively. The outdoor heat exchanger 23 is disposed at the bottom of the casing 21. The outdoor heat exchanger 23 may be, but is not limited to, a fin-and-coil type heat exchanger, a plate type heat exchanger, and the like. An expansion device (not shown) is also provided within the housing 21. The expansion device may be an electronic expansion valve, a thermostatic expansion valve, or other suitable expansion device. The compressor, the indoor heat exchanger 12, the expansion device, and the outdoor heat exchanger 23 are connected in sequence by a refrigerant pipe 16, forming a refrigeration circuit allowing a refrigerant to circulate therein. The refrigerant includes but is not limited to R34a.
With continued reference to fig. 2, an outdoor fan 24 is also provided at the top of the housing 21. The outdoor fan 24 includes an outdoor motor (not shown) and an outdoor fan (not shown) fixed to a motor shaft of the outdoor motor. When the outdoor motor is controlled to rotate, the outdoor fan rotates, thereby forming an air flow flowing in the housing 21. The air flow is cooled by passing over the surface of the outdoor heat exchanger 23 (functioning as an evaporator), so that the refrigerant flowing in the outdoor heat exchanger 23 is evaporated. In one or more embodiments, a temperature sensor (not shown) is disposed on a surface of the outdoor motor to detect a temperature of the outdoor motor in real time. With continued reference to fig. 2, a top grill 2121 of generally circular shape is also provided on the top wall 212 of the housing 21 so that the air flow generated when the outdoor fan 24 rotates can be discharged through the top grill 2121. It is noted that, in this context, unless explicitly stated to the contrary, when the outdoor motor "rotates in the forward direction", air from the outside environment is drawn into the casing 21, flows over the surface of the outdoor heat exchanger 23 and is discharged from the top grill 2121; when the outdoor motor "rotates in reverse", air of the external environment is drawn into the casing 21 from the top grill 2121, thereby blowing the outdoor heat exchanger 23.
In the following, the detection method for the drying system 1 according to the present invention is described in detail based on any of the above embodiments of the drying system 1 according to the present invention. It should be noted that the detection method can also be used in other suitable drying systems (e.g., vertical air conditioner, multi-split air conditioner, etc.).
Fig. 3 is a schematic flow chart of a detection method for a drying system according to the present invention. As shown in fig. 3, in one or more embodiments, when the detection method for drying system 1 of the present invention is started, step S1 of detecting the suction pressure of the compressor of drying system 1 is first performed. The suction pressure of the compressor may be detected by a pressure sensor disposed at a suction port of the compressor. Next, the suction pressure is compared with a preset suction pressure interval (step S2). In one or more embodiments, the predetermined suction pressure interval is greater than or equal to a predetermined minimum suction pressure and less than or equal to a product of the predetermined minimum suction pressure and a proportionality coefficient, wherein the proportionality coefficient is in a range of 1.2-1.3. In one or more embodiments, the predetermined minimum suction pressure is 0.05MPa (megapascals). Alternatively, the preset minimum suction pressure may be set to other suitable pressure values higher or lower than 0.05 Mpa. When the suction pressure falls within the preset suction pressure interval, the real-time temperature of the outdoor motor is detected, and the temperature difference between the real-time temperature and the starting temperature of the outdoor motor is determined (step S3). It is noted that the temperature of the outdoor motor is detected by a temperature sensor disposed on the surface of the outdoor motor. The "starting temperature of the outdoor motor" refers to a temperature measured by the temperature sensor when the outdoor motor starts to rotate. Then, the temperature difference is compared with a preset temperature difference (step S4). Finally, it is judged whether the outdoor heat exchanger 23 of the drying system 1 is dirty or not based on the comparison result.
Fig. 4 is a flowchart illustrating a detecting method for a drying system according to a first embodiment of the present invention. As shown in fig. 4, in one or more embodiments, when the detection method for drying system 1 of the present invention is started, step S1 of detecting the suction pressure of the compressor of drying system 1 is first performed. Then, step S21 is executed to determine whether the suction pressure is greater than or equal to the preset minimum suction pressure and less than or equal to the product of the preset minimum suction pressure and the proportionality coefficient. If the determination result is yes, the detection method proceeds to step S22, where it is continuously determined whether the suction pressure is greater than the product of the preset minimum pressure and the proportional coefficient. If the judgment result is yes, the suction pressure of the compressor is higher at the moment, and the drying system 1 operates normally, the step S1 is repeatedly executed, that is, the suction pressure of the compressor of the drying system 1 is continuously detected. If the judgment result is negative, the suction pressure of the compressor is smaller than the preset lowest suction pressure at the moment, and the drying system 1 operates abnormally. Therefore, in order to ensure the normal operation of the compressor, the compressor is controlled to stop and a malfunction alarm is issued (step S70). When step S70 is completed, the detection method ends.
With continued reference to fig. 4, after the step S21 is executed, when the determination result is yes, step S31 is executed to detect the real-time temperature of the outdoor motor and determine a temperature difference between the real-time temperature and the starting temperature of the outdoor motor. Next, step S41 is executed to determine whether the temperature difference is smaller than a preset temperature difference. In one or more embodiments, the predetermined temperature difference is 60 ℃. Alternatively, the preset temperature difference value may be set to other suitable values higher or lower than 60 ℃. If the determination result is yes, it is determined that the outdoor heat exchanger 23 is not dirty because the increase in the outdoor motor temperature is small (step S51), and the detection method ends. In one or more embodiments, after step S51 is completed, the detection method re-executes step S1 to re-determine whether the outdoor heat exchanger 23 is dirty or not.
With continued reference to fig. 4, when the determination result is no after execution of step S41, it is explained that the increase in the outdoor motor temperature is large at this time, and therefore it is determined that the outdoor heat exchanger 23 is dirty (step S52). In one or more embodiments, when it is determined that the outdoor heat exchanger 23 is dirty, the drying system 1 is configured to send a prompt message to a user. The form of the prompting message includes but is not limited to an indicator light, an alarm bell, etc. When step S52 is completed, the detection method performs step S61 of controlling the outdoor motor to rotate reversely at the first rotation speed. In one or more embodiments, the first rotational speed is 2000rpm (revolutions per minute). Alternatively, the first rotational speed may be set to other suitable rotational speeds faster or slower than 2000 rpm. By controlling the outdoor motor to rotate reversely at a high rotating speed, impurities adsorbed on the surface of the outdoor heat exchanger 23 can be effectively blown away and cleaned. Next, the detection method proceeds to step S62, and the suction pressure of the compressor is re-detected after a first preset time period has elapsed. In one or more embodiments, the first preset time period is 5s (seconds). Alternatively, the first preset time period may be set to other suitable times more or less than 5 s. Then, it is determined whether the current suction pressure is equal to or higher than the preset minimum suction pressure and equal to or lower than the product of the preset minimum suction pressure and the proportionality coefficient (step S63). And when the judgment result is negative, the suction pressure is larger than the product of the preset minimum suction pressure and the proportionality coefficient. That is, after the impurities on the surface of the outdoor heat exchanger 23 are cleaned and the suction pressure of the compressor is recovered to normal, the outdoor motor is controlled to rotate in the forward direction at the second rotation speed (step S64) to ensure that the outdoor heat exchanger 23 has good heat exchange efficiency. In one or more embodiments, the second rotational speed is 1500rpm (revolutions per minute). Alternatively, the second speed may be set to another suitable speed faster or slower than 1500 rpm. When step S64 is completed, the detection method ends.
With continued reference to fig. 4, after step S63 is performed, when the determination result is yes, which indicates that the suction pressure of the compressor is still low at this time, and the impurities adsorbed on the surface of the outdoor heat exchanger 23 are not completely removed, step S65 is performed, in which the outdoor motor is controlled to continue to rotate in the reverse direction at the first rotation speed. Next, after the first preset time period has elapsed, the suction pressure of the compressor is re-detected again (step S66). Then, it is determined whether the current suction pressure is greater than or equal to the preset minimum suction pressure and less than or equal to the product of the preset minimum suction pressure and the proportionality coefficient (step S67). And when the judgment result is negative, the suction pressure is larger than the product of the preset minimum suction pressure and the proportionality coefficient. That is, after the impurities on the surface of the outdoor heat exchanger 23 are continuously cleaned and the suction pressure of the compressor is restored to normal, the outdoor motor is controlled to rotate in the forward direction at the second rotation speed (step S68) to ensure that the outdoor heat exchanger 23 has good heat exchange efficiency. When step S68 is completed, the detection method ends.
With continued reference to fig. 4, after step S67 is executed, when the determination result is yes, it indicates that the suction pressure of the compressor is still low, and the impurities adsorbed on the surface of the outdoor heat exchanger 23 cannot be effectively cleaned by the reverse rotation of the outdoor motor. Accordingly, the outdoor motor is controlled to stop and a malfunction alarm is issued (step S69) to remind the user to clean up the impurities in time by other means. When step S69 is completed, the detection method ends.
Fig. 5 is a flowchart illustrating a second embodiment of a detection method for a drying system according to the present invention. As shown in FIG. 5, in one or more embodiments, after step S41 is performed, when the determination is yes, the detection method proceeds to step S42, i.e., it is determined whether the real-time temperature is less than the maximum temperature threshold. In one or more embodiments, the maximum temperature threshold is 100 ℃. Alternatively, the maximum temperature threshold may be set to other suitable values higher or lower than 100 ℃. If the determination result is negative, it indicates that the real-time temperature of the outdoor motor, the temperature difference between the real-time temperature and the starting-up temperature are all small at this time, and it is determined that the outdoor heat exchanger 23 is not dirty (step S51). When the judgment result is yes, the fact that the real-time temperature of the outdoor motor is higher although the temperature difference value between the real-time temperature of the outdoor motor and the starting temperature is smaller than the preset temperature difference value is shown. For example, when the temperature of the external environment is high, the starting temperature of the outdoor motor is also high, the real-time temperature of the outdoor motor has been greatly increased (but the temperature difference has not exceeded the preset temperature difference), and at this time, the outdoor heat exchanger 23 still has a high risk of filth blockage. Therefore, it is determined that the outdoor heat exchanger 23 is dirty. It should be noted that the parts of the second embodiment that are not mentioned may be configured the same as the first embodiment, and are not described herein again.
The present invention also provides a storage medium (not shown). The storage medium is configured to store a plurality of program codes adapted to be loaded and run by the processor to perform the detection method for the drying system 1 as described in any of the above embodiments. In one or more embodiments, the control system (not shown in the figures) of the drying system 1 of the present invention comprises the storage medium in order to perform the detection method of the present invention for the drying system 1.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A detection method for a drying system, the detection method comprising:
detecting the suction pressure of a compressor of the drying system;
comparing the suction pressure with a preset suction pressure interval;
when the suction pressure falls into the preset suction pressure interval, detecting the real-time temperature of the outdoor motor, and determining the temperature difference between the real-time temperature and the starting temperature of the outdoor motor;
comparing the temperature difference value with a preset temperature difference value;
and judging whether the outdoor heat exchanger of the drying system is dirty or not based on the comparison result.
2. The inspection method for a drying system according to claim 1,
and when the temperature difference is greater than or equal to the preset temperature difference, judging that the outdoor heat exchanger is dirty and blocked.
3. The detecting method for a drying system according to claim 2,
and when the temperature difference is smaller than the preset temperature difference, judging that the outdoor heat exchanger is not dirty and blocked.
4. The inspection method for a drying system according to claim 2,
when the temperature difference value is smaller than the preset temperature difference value, comparing the real-time temperature with a maximum temperature threshold value;
when the real-time temperature is smaller than the maximum temperature threshold, judging that the outdoor heat exchanger is not dirty and blocked;
and when the real-time temperature is greater than or equal to the maximum temperature threshold, judging that the outdoor heat exchanger is dirty and blocked.
5. The detecting method for drying system as claimed in claim 1, wherein when it is determined that the outdoor heat exchange is dirty, the detecting method further comprises:
and controlling the outdoor motor to reversely rotate at a first rotating speed.
6. The detecting method for a drying system according to claim 5,
after a first preset time period, detecting the suction pressure of the compressor again;
comparing the newly measured suction pressure with the preset suction pressure interval;
and when the suction pressure exceeds the preset suction pressure interval, controlling the outdoor motor to rotate positively at a second rotating speed.
7. The inspection method for a drying system according to claim 6,
when the suction pressure falls into the preset suction pressure interval, controlling the outdoor motor to continuously rotate reversely at the first rotating speed;
after the first preset time period, detecting the suction pressure of the compressor again;
when the current suction pressure exceeds the preset suction pressure interval, controlling the outdoor motor to rotate positively at the second rotating speed; and is
When the current suction pressure falls into the preset suction pressure interval, the outdoor motor is controlled to stop, and a fault alarm is sent out.
8. The detecting method for drying system of any one of claims 1 to 7, wherein said preset suction pressure interval is equal to or greater than a preset lowest suction pressure and equal to or less than a product of said preset lowest suction pressure and a proportionality coefficient,
wherein the range of the proportionality coefficient is 1.2-1.3.
9. A storage medium, characterized in that the storage medium is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and executed by a processor to perform the detection method for a drying system of any one of claims 1-8.
10. A drying system, characterized in that the drying system comprises a storage medium according to claim 9.
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| CN202210744245.XA CN115164525A (en) | 2022-06-27 | 2022-06-27 | Detection method for drying system, storage medium and drying system |
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