CN111141012A - Pipeline stress control method and air conditioner control system - Google Patents
Pipeline stress control method and air conditioner control system Download PDFInfo
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- CN111141012A CN111141012A CN201911351394.4A CN201911351394A CN111141012A CN 111141012 A CN111141012 A CN 111141012A CN 201911351394 A CN201911351394 A CN 201911351394A CN 111141012 A CN111141012 A CN 111141012A
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- General Physics & Mathematics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a pipeline stress control method and an air conditioner control system, which comprise the steps of obtaining a pipeline stress value and controlling the running frequency of a compressor according to the stress value, wherein the obtained pipeline stress value comprises a pipeline stress value in a starting stage and a pipeline stress value in a running stage. Aiming at the existing condition of the air conditioning unit, the pipeline stress value is divided into a starting stage pipeline stress value and an operating stage pipeline stress value, and the working conditions of the compressors in the starting stage and the operating stage are different, so that the starting stage pipeline stress value and the operating stage pipeline stress value are distinguished, the compressors can be adjusted more accurately, and the pipeline damage caused by the improvement of the stress value is avoided. When the stress acquisition is carried out on a specific pipeline through a stress sensor, the stress sensor can actually detect the stress value on the pipeline and make reference for adjusting the compressor. The stress sensor is arranged on a pipeline which is preferably connected with a suction port or a discharge port of the compressor. When the stress value exceeds the preset requirement, the frequency point of the compressor at the moment can be skipped, and the pipeline is prevented from being cracked and leaked.
Description
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a pipeline stress control method and an air conditioning control system.
Background
The air conditioning unit can cause the vibration of pipelines due to the mechanical vibration of a compressor and the flowing and state change of refrigerant in the system, and the vibration of partial pipelines, especially pipelines connected with a suction port or an exhaust port of the compressor, is particularly large, and the local stress concentration condition exists, which can cause the pipeline to be broken. At present, in order to solve such problems, air conditioner manufacturers mainly adopt strategies of optimizing pipeline design and shielding vibration or stress-increased state points, namely, during development, pipeline stress is tested, the state points with higher stress are shielded, and when a compressor runs, the frequency is skipped. The method has the advantages that the simulation scenes in a laboratory are limited, the method can be simply processed in a limited working condition range, and the method has no universal adaptability.
Disclosure of Invention
In order to solve at least one of the above problems, the present invention provides a method for controlling pipeline stress, which includes obtaining a pipeline stress value and controlling an operating frequency of a compressor according to the stress value, where the obtained pipeline stress value includes a start-up stage pipeline stress value and an operating stage pipeline stress value.
Aiming at the existing condition of the air conditioning unit, the pipeline stress value is divided into a starting stage pipeline stress value and an operating stage pipeline stress value, and the working conditions of the compressors in the starting stage and the operating stage are different, so that the starting stage pipeline stress value and the operating stage pipeline stress value are distinguished, the compressors can be adjusted more accurately, and the pipeline damage caused by the improvement of the stress value is avoided.
When the stress acquisition is carried out on a specific pipeline through a stress sensor, the stress sensor can actually detect the stress value on the pipeline and make reference for adjusting the compressor. The stress sensor is arranged on a pipeline which is preferably connected with a suction port or a discharge port of the compressor. When the stress value exceeds the preset requirement, the frequency point of the compressor at the moment can be skipped, and the pipeline is prevented from being cracked and leaked.
Preferably, the pipeline stress value in the starting stage is from the start of the compressor until the frequency of the compressor is greater than or equal to a first preset frequency A and the running time isT is greater than or equal to pipeline stress value sigma during first preset time B1。
The first preset frequency A is the lowest running frequency required by the compressor or the lowest frequency set by an air conditioner manufacturer.
Because the stress value is always in the process of dynamic change when the compressor runs, a relatively stable working section is required to be selected to determine the current stress value, the stipulation is given in the scheme, the current stress value can present the condition of the working condition at the moment, and uncertain data cannot be brought by stirring.
Preferably, the line stress value σ at the start-up stage1At intervals of time T1And obtaining the data once.
In practical use, the value can be set to T1＝10s。
Preferably, the controlling the compressor operating frequency according to the stress value includes:
when the pipeline stress value sigma is in the starting stage1Greater than or equal to a predetermined stress value sigma0Adjusting the frequency of the compressor to a first preset frequency;
interval time T1Then, if the pipeline stress value sigma at the starting stage1Greater than or equal to a predetermined stress value sigma0And the compressor finishes the starting stage and enters the running stage.
By comparing the stress value of the pipeline in the real-time starting stage with the preset value, the phenomenon that the pipeline is broken due to overlarge stress value caused by vibration can be prevented.
Preferably, the interval time T1After that, the stress value sigma of the pipeline in the starting stage1Less than a predetermined stress value sigma0And keeping the frequency of the compressor at the first preset frequency until the starting stage is finished.
At this time, the normal working condition is adopted, and the preheating is kept in the state.
Preferably, the pipeline stress value in the operation stage is a pipeline stress value sigma after the compressor continuously operates for a first preset time B2。
Because the stress value is changed at any time along with different working states of the compressor, particularly just before entering the operation stage, the stress value can be collected after the compressor is stably operated for a period of time, and the accuracy of data collection is kept.
Preferably, the operating phase line stress value σ2At intervals of time T2Once in seconds.
Real-time measurement of pipeline stress value sigma in operation stage2The monitoring of the whole operation period is ensured.
Preferably, the controlling the compressor operating frequency according to the stress value comprises the following steps:
pipeline stress value sigma in operation stage2Greater than or equal to a predetermined stress value sigma0When the current is over;
if the compressor frequency is greater than 50% of the rated compressor frequency, every interval T2Regulating down the second preset frequency of compressor frequency when the pipeline stress value sigma in operation stage is satisfied2Less than a predetermined stress value sigma0Or stopping reducing the frequency of the compressor when the accumulated frequency of the reduced compressor is 10% of the rated frequency;
if the frequency of the compressor is less than or equal to 50% of the rated frequency of the compressor at the moment, every interval time T2Second preset frequency for adjusting the frequency of the compressor is adjusted up, and when the pipeline stress value sigma of the operation stage is met2Less than a predetermined stress value sigma0Or when the frequency of the upper pressure regulating compressor is accumulated to be 10% of the rated frequency, the frequency of the upper pressure regulating compressor is stopped.
By adopting the control scheme, the direct shutdown of the compressor can be avoided, the use experience is poor, the compressor is stabilized at a proper frequency, and the damage to the pipeline caused by overlarge stress is prevented.
Preferably, the first preset time B is 10min-15 min; and/or the first predetermined frequency is a compressor minimum operating frequency; and/or a predetermined stress value sigma0Is 18-25 MPa.
In practical use, the first preset time B can be set to be 10min-15 min; predetermined stress value sigma0Is 18-25MPa, and ensures the use effect.
The application also provides an air conditioner control system, including stress detection module and control module, the pressure detection module includes stress sensor, stress sensor installs on the air conditioner pipeline, control module uses above-mentioned technical scheme pipeline stress control method.
In the technical scheme, the stress state of the pipeline is detected in real time, and the whole operation period can be monitored; the frequency of the compressor can be adjusted in real time according to the stress state, so that stress over-standard points are avoided, and pipelines are protected. The traditional preset protection value under only individual working condition test is replaced.
Drawings
Fig. 1 is a block flow diagram.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The method for controlling the pipeline stress comprises the steps of obtaining a pipeline stress value and controlling the operation frequency of a compressor according to the stress value, wherein the obtained pipeline stress value comprises a starting stage pipeline stress value and an operation stage pipeline stress value. Aiming at the existing condition of the air conditioning unit, the pipeline stress value is divided into a starting stage pipeline stress value and an operating stage pipeline stress value, and the working conditions of the compressors in the starting stage and the operating stage are different, so that the starting stage pipeline stress value and the operating stage pipeline stress value are distinguished, the compressors can be adjusted more accurately, and the pipeline damage caused by the improvement of the stress value is avoided. When the stress acquisition is carried out on a specific pipeline through a stress sensor, the stress sensor can actually detect the stress value on the pipeline and make reference for adjusting the compressor. The stress sensor is arranged on a pipeline which is preferably connected with a suction port or a discharge port of the compressor. When the stress value exceeds the preset requirement, the frequency point of the compressor at the moment can be skipped, and the pipeline is prevented from being cracked and leaked.
Compare in prior art among this technical scheme according to the default under the laboratory condition in, avoid the great compressor frequency's of resonance solution, can adjust compressor frequency according to actual conditions, prevent that difference from appearing in laboratory test and actual working condition, lead to the default can not realize the purpose of reducing stress. Secondly, the stress detection and the compressor control are equally divided into two stages, namely a starting stage and an operating stage, and the working states of the compressor are different in the starting stage and the operating stage, so that different control schemes are provided according to different characteristics of the compressor, and the control is more accurate.
First, in the present embodiment, a limitation is made on a start-up stage pipeline stress value, which is a pipeline stress value σ during a period from the start of the compressor until the compressor frequency is greater than or equal to the first preset frequency a and the operation time T is greater than or equal to the first preset time B1. The first preset frequency A is the lowest running frequency required by the compressor or the lowest frequency set by an air conditioner manufacturer. Because the stress value is always in the process of dynamic change when the compressor runs, a relatively stable working section is required to be selected to determine the current stress value, the stipulation is given in the scheme, the current stress value can present the condition of the working condition at the moment, and uncertain data cannot be brought by stirring.
In order to realize real-time monitoring, the pipeline stress value sigma at the starting stage1At intervals of time T1And obtaining the data once. In practical use, the value can be set to T1A time of 10s or less makes the data accurate.
Aiming at the stress value obtained in the starting stage, the compressor makes the following feedback, and the compressor running frequency is controlled according to the stress value, wherein the feedback comprises the following steps:
when the pipeline stress value sigma is in the starting stage1Greater than or equal to a predetermined stress value sigma0Adjusting the frequency of the compressor to a first preset frequency;
interval time T1Then, if the pipeline stress value sigma at the starting stage1Greater than or equal to a predetermined stress value sigma0And the compressor finishes the starting stage and enters the running stage.
By comparing the stress value of the pipeline in the real-time starting stage with the preset value, the phenomenon that the pipeline is broken due to overlarge stress value caused by vibration can be prevented. Because the data collected during the initial start are inaccurate, the system can operate T1Post-acquisition stress value, wherein T1May be set to 10 s.
If the working state is normal, the interval time T1After that, the stress value sigma of the pipeline in the starting stage1Less than a predetermined stress value sigma0And keeping the frequency of the compressor at the first preset frequency until the starting stage is finished.
At the moment, the working condition is normal, the frequency of the compressor does not need to be controlled, and the preheating in the state is kept. Meanwhile, the compressor makes feedback according to the stress value obtained in the starting stage, wherein the pipeline stress value in the operation stage is the pipeline stress value sigma after the compressor continuously operates for the first preset time B2. Because the stress value is changed at any time along with different working states of the compressor, particularly just before entering the operation stage, the stress value can be collected after the compressor is stably operated for a period of time, and the accuracy of data collection is kept.
In order to realize real-time monitoring in the above embodiment, the pipeline stress value σ in the operation stage2At intervals of time T2Once in seconds. Real-time measurement of pipeline stress value sigma in operation stage2The monitoring of the whole operation period is ensured. In practical use, the value can be set to T2A time of 10s or less makes the data accurate.
Aiming at the stress value obtained in the operation stage, the compressor makes the following feedback, and the operation frequency of the compressor is controlled according to the stress value, including the operation frequency control of the compressor in the operation stage:
pipeline stress value sigma in operation stage2Greater than or equal to a predetermined stress value sigma0When the current is over;
if the compressor frequency is greater than 50% of the rated compressor frequency, every interval T2Regulating down the second preset frequency of compressor frequency when the pipeline stress value sigma in operation stage is satisfied2Less than a predetermined stress value sigma0Or stopping reducing the frequency of the compressor when the accumulated frequency of the reduced compressor is 10% of the rated frequency;
if the frequency of the compressor is less than or equal to 50% of the rated frequency of the compressor at the moment, every interval time T2Second up-regulating the compressor frequency to a second predetermined frequency whenThe condition that the pipeline stress value sigma 2 is smaller than the preset stress value sigma at the operation stage is met0Or when the frequency of the upper pressure regulating compressor is accumulated to be 10% of the rated frequency, the frequency of the upper pressure regulating compressor is stopped.
By adopting the control scheme, the direct shutdown of the compressor can be avoided, the use experience is poor, the compressor is stabilized at a proper frequency, and the damage to the pipeline caused by overlarge stress is prevented. Meanwhile, in the above embodiment, the second preset frequency may be set to a smaller value, for example, 1HZ, and the change setting is lower, so that the operation adjustment is more stable.
In a specific embodiment, the first preset time B is 10min to 15min, preferably 10 min; and/or the first predetermined frequency is a compressor minimum operating frequency; and/or a predetermined stress value sigma0Is 18-25 MPa.
In practical use, the first preset time B can be set to be 10min-15 min; predetermined stress value sigma0The pressure is 18-25MPa, and the above empirical data is adopted for the existing machine type, so that the stable operation of the product can be ensured to the greatest extent, and the failure rate is reduced.
The application also provides an air conditioner control system, including stress detection module and control module, the pressure detection module includes stress sensor, stress sensor installs on the air conditioner pipeline, control module uses above-mentioned technical scheme pipeline stress control method.
In the technical scheme, the stress state of the pipeline is detected in real time, and the whole operation period can be monitored; the frequency of the compressor can be adjusted in real time according to the stress state, so that stress over-standard points are avoided, and pipelines are protected. The traditional preset protection value under only individual working condition test is replaced.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A pipeline stress control method comprises the steps of obtaining a pipeline stress value and controlling the running frequency of a compressor according to the stress value, and is characterized in that: the obtained pipeline stress value comprises a pipeline stress value in a starting stage and a pipeline stress value in an operating stage.
2. The method of claim 1, wherein: the pipeline stress value in the starting stage is the pipeline stress value sigma during the period from the start of the compressor to the time when the frequency of the compressor is more than or equal to a first preset frequency A and the running time T is more than or equal to a first preset time B1。
3. The method of claim 2, wherein: the stress value sigma of the pipeline at the starting stage1At intervals of time T1And obtaining the data once.
4. The method of claim 3, wherein: the method comprises the following steps of controlling the running frequency of the compressor according to the stress value, wherein the control of the running frequency of the compressor in the starting stage comprises the following steps:
when the pipeline stress value sigma is in the starting stage1Greater than or equal to a predetermined stress value sigma0Adjusting the frequency of the compressor to a first preset frequency;
interval time T1Then, if the pipeline stress value sigma at the starting stage1Greater than or equal to a predetermined stress value sigma0And the compressor finishes the starting stage and enters the running stage.
5. The method of claim 4, wherein: interval time T1After that, the stress value sigma of the pipeline in the starting stage1Less than a predetermined stress value sigma0And keeping the frequency of the compressor at the first preset frequency until the starting stage is finished.
6. The method of claim 1, wherein: and the pipeline stress value in the operation stage is the pipeline stress value sigma 2 after the compressor continuously operates for the first preset time B.
7. The method of claim 6, wherein the step of removing the metal oxide layer comprises removing the metal oxide layer from the metal oxide layerIn the following steps: the stress value sigma of the pipeline in the running stage2At intervals of time T2And obtaining the data once.
8. The method of claim 7, wherein: the method comprises the following steps of controlling the running frequency of the compressor according to the stress value, wherein the control of the running frequency of the compressor in the running stage comprises the following steps:
when the pipeline stress value sigma 2 is greater than or equal to the preset stress value sigma in the operation stage0When the current is over;
if the compressor frequency is greater than 50% of the rated compressor frequency, every interval T2Regulating down the second preset frequency of compressor frequency when the pipeline stress value sigma in operation stage is satisfied2Less than a predetermined stress value sigma0Or stopping reducing the frequency of the compressor when the accumulated frequency of the reduced compressor is 10% of the rated frequency;
if the frequency of the compressor is less than or equal to 50% of the rated frequency of the compressor at the moment, every interval time T2Second preset frequency for adjusting the frequency of the compressor is adjusted up, and when the pipeline stress value sigma of the operation stage is met2Less than a predetermined stress value sigma0Or when the frequency of the upper pressure regulating compressor is accumulated to be 10% of the rated frequency, the frequency of the upper pressure regulating compressor is stopped.
9. The method of claim 2, wherein: the first preset time B is 10min-15 min; and/or the first predetermined frequency is a compressor minimum operating frequency; and/or a predetermined stress value sigma0Is 18-25 MPa.
10. An air conditioner control system, comprising a stress detection module and a control module, wherein the pressure detection module comprises a stress sensor, the stress sensor is installed on an air conditioner pipeline, and the control module applies the pipeline stress control method as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911351394.4A CN111141012A (en) | 2019-12-24 | 2019-12-24 | Pipeline stress control method and air conditioner control system |
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| CN201911351394.4A CN111141012A (en) | 2019-12-24 | 2019-12-24 | Pipeline stress control method and air conditioner control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113587390A (en) * | 2021-07-26 | 2021-11-02 | Tcl空调器(中山)有限公司 | Pipeline protection method and device, air conditioner and computer readable storage medium |
| CN114251799A (en) * | 2021-12-01 | 2022-03-29 | 格力电器（合肥）有限公司 | Air conditioner stress evaluation method and device and air conditioner |
| CN114777323A (en) * | 2022-05-16 | 2022-07-22 | 广东美的制冷设备有限公司 | Control method and control device of air conditioner, air conditioner and storage medium |
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