CN112611215B - Control method of air source heat pump dryer with parallel double systems - Google Patents
Control method of air source heat pump dryer with parallel double systems Download PDFInfo
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- CN112611215B CN112611215B CN202011437706.6A CN202011437706A CN112611215B CN 112611215 B CN112611215 B CN 112611215B CN 202011437706 A CN202011437706 A CN 202011437706A CN 112611215 B CN112611215 B CN 112611215B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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Abstract
The invention discloses a control method of an air source heat pump dryer with parallel double systems, wherein the dryer comprises two compressors, and the method comprises the following steps: judging the state of the compressor; if the two compressors are in a normal running state, executing a first control process; if one is in a normal operation state and the other is in a fault shutdown state, executing a second control process; the first control process includes: controlling the opening or closing of the two compressors according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest running time of the compressors and the shortest stopping time of the compressors; the second control process includes: and controlling the opening or closing of the compressor in the normal operation state according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest operation time of the compressor and the shortest shutdown time of the compressor. The invention can improve the stability and drying effect of drying temperature and improve the reliability and stability of the whole dryer.
Description
Technical Field
The invention belongs to the technical field of heat pump dryers, and particularly relates to a control method of an air source heat pump dryer with parallel double systems.
Background
At present, a compressor in a refrigerant circulating system of an air source heat pump dryer is generally a fixed-frequency compressor and limited by the capacity of the compressor, two refrigerant circulating systems are mostly connected in parallel to operate in the existing dryer, each system is provided with one compressor, and the two compressors in parallel operation are utilized for heating control to meet the drying requirement.
For an air source heat pump dryer with a parallel dual system, in the prior art, the start and stop of a compressor are generally controlled according to a target temperature, when the temperature in a drying chamber is lower than the target temperature by a certain value, the two compressors are controlled to start, and two refrigerant circulating systems are heated simultaneously; and when the temperature in the drying chamber is higher than a certain target temperature value, controlling the two compressors to stop.
The existing control method for controlling the starting and stopping of the compressor simply according to the difference value with the target temperature has large fluctuation of the whole temperature curve in the drying chamber, is difficult to reach a stable state and influences the drying effect. Moreover, the control method enables the compressor to be started and stopped frequently, the compressor is easy to damage or damage, and the reliability and stability of the whole system are poor.
Disclosure of Invention
The invention aims to provide a control method of an air source heat pump dryer with parallel double systems, which aims to improve the stability and drying effect of drying temperature and improve the reliability and stability of the whole dryer.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a method of controlling an air source heat pump dryer having dual systems in parallel, the dryer including two compressors, the method comprising:
judging whether the compressor is in a normal operation state or a fault shutdown state;
if the two compressors are in a normal running state, executing a first control process;
if one compressor is in a normal operation state and the other compressor is in a fault shutdown state, executing a second control process;
the first control process includes:
controlling the opening or closing of the two compressors according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest running time of each compressor and the shortest shutdown time of each compressor;
the second control process includes:
and controlling the opening or closing of the compressor in a normal running state according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest running time of the compressor and the shortest shutdown time of the compressor.
In the above control method, the first control process specifically includes:
summing the main temperature difference and the auxiliary temperature difference to obtain a reference temperature difference;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, starting all the compressors with the shortest shutdown time; the first coefficient is a positive number;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, starting one of the compressors with the shortest shutdown time; the second coefficient is a positive number less than the first coefficient;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, or when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, the states of the two compressors are kept unchanged;
when the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and a second coefficient and is not greater than the product of the reference temperature difference and the first coefficient, one of the compressors with the shortest running time is closed;
and when the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, closing all the compressors with the shortest running time.
The control method as described above, the first control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, if the stop time does not reach the shortest stop time of the compressor, the compressor is kept closed, and meanwhile, the electric heating of the compressor is started; the electrical heating of the compressor is turned off when the minimum shutdown time is reached, while the compressor is turned on.
The control method as described above, in the first control process,
the starting of one of the compressors with the shortest shutdown time is specifically as follows: starting the compressor with the shutdown time reaching the shortest shutdown time of the compressor firstly;
the step of turning off one of the compressors with the shortest running time includes: the compressor whose operation time reaches the shortest operation time of the compressor first is turned off.
The control method as described above, the first control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor with longer shutdown time does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; and starting the compressor when the shutdown time of the compressor reaches the minimum shutdown time, and simultaneously closing an electric heater of the compressor.
In the control method, the second control process specifically includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, starting an electric heater corresponding to the compressor in the fault shutdown state, and starting the compressor when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, starting the compressor when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, or when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient, the state of the compressor in the normal operation state is kept unchanged;
and when the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, closing the compressor when the running time of the compressor in the normal running state reaches the shortest running time.
The control method as described above, the second control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, if the shutdown time of the compressor in the normal running state does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; the electric heater of the compressor is turned off when the minimum shutdown time is reached, while the compressor is turned on.
The control method as described above, the second control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor in the normal running state does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; and when the shortest shutdown time is reached, the compressor is started, and the electric heater of the compressor and the electric heater corresponding to the compressor in the fault shutdown state are simultaneously closed.
The control method as described above, the dryer further including a generator, and after determining that the compressor is in the malfunction stop state, the method further includes:
judging whether the fault is a power failure fault or not;
if so, controlling the generator to supply power to the electric heater corresponding to the compressor which is in fault shutdown;
if not, the power supply of the dryer stopped in the fault is utilized to supply power to the electric heater of the dryer.
Preferably, the electric heater comprises a plurality of independently controlled electric heating units.
Compared with the prior art, the invention has the advantages and positive effects that: when the air source heat pump dryer with the parallel double systems is controlled, the state of an outer machine of the dryer is judged firstly, and different control processes are executed according to the condition that a compressor in the outer machine is in a normal operation state or a fault shutdown state, so that the drying effect of the dryer is ensured as much as possible; when concrete control, except utilizing the main difference in temperature and the supplementary difference in temperature formed the degree of deviation of difference in temperature control compressor open or close, still according to the shortest operating time and the shortest dead time of compressor to control opening and closing of compressor, not only can make the temperature fluctuation scope in the drying chamber reduce, and stoving temperature tends towards stable equilibrium state, further improves the stoving effect, can also fully protect the compressor, improves the reliability and the stability of drying-machine operation.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of a method of controlling an air source heat pump dryer of the present invention;
FIG. 2 is a flow diagram of another embodiment of the first control process of FIG. 1;
fig. 3 is a flowchart of another embodiment of the second control process of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
The invention provides a novel control scheme, which aims to solve the problems of large drying temperature fluctuation, unsatisfactory drying effect and easy damage or damage of a compressor caused by the fact that the conventional air source heat pump dryer with a parallel double system controls the start and stop of the compressor only according to the difference value with the target temperature.
Referring to fig. 1, there is shown a flow chart of an embodiment of a control method of an air source heat pump dryer of the present invention, specifically, a flow chart of an embodiment of a compressor control for an air source heat pump dryer having two compressors connected in parallel.
As shown in fig. 1, this embodiment implements control of the dryer using the following processes:
step 101: the dryer is started to operate, and the state of the compressor is judged.
The states of the compressor include a fault shut-down state and a normal operation state. The judgment of the state of the compressor can be realized according to the signals of the compressor acquired by the host control unit, and the specific adopted signals can be realized according to the possible means in the prior art. For example, after the compressor is in fault shutdown, a fault shutdown signal is fed back to the host control unit, and the host control unit judges whether the compressor is in a fault shutdown state according to whether the fault shutdown signal is acquired; when the compressor normally operates, the host control unit can acquire a current signal representing the normal operation of the compressor, and the host control unit can judge whether the compressor is in a normal operation state according to the current signal.
Step 102: and judging whether the two compressors are in a normal running state or not. If yes, go to step 103; otherwise, go to step 104.
Step 103: a first control process is executed.
In the case where it is determined that both the compressors are in the normal operation state, the first control process is executed. The first control process specifically comprises: and controlling the two compressors to be started or closed according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest running time of each compressor and the shortest shutdown time of each compressor.
The real-time indoor temperature can be detected and obtained through a temperature detection device such as a dry bulb thermometer arranged indoors. The set indoor temperature is the set drying temperature which can be achieved in the expected room, and the main temperature difference and the auxiliary temperature difference are known values and can be modified through authorization. The main temperature difference and the auxiliary temperature difference constitute a temperature difference deviation degree, which is a temperature difference value used for controlling a compressor of the dryer. The shortest running time and the shortest stopping time of the compressors can be determined according to the models of the compressors, and for the air source heat pump dryer with the parallel double systems, the shortest running time and the shortest stopping time of the two compressors can be equal or not.
Step 104: and judging whether one of the two compressors is in a normal operation state and the other compressor is in a fault shutdown state. If yes, go to step 105; otherwise, go to step 106.
Step 105: a second control process is executed.
When it is determined that one of the two compressors is in a normal operation state and the other is in a failed shutdown state, a second control process is executed. The second control process specifically comprises the following steps: and controlling the opening or closing of the compressor in the normal running state according to the real-time indoor temperature, the set indoor temperature, the main temperature difference and the auxiliary temperature difference, and the shortest running time and the shortest shutdown time of the compressor in the normal running state.
In the second control process, because one compressor is stopped due to faults, the start and stop of the compressor in the normal running state are controlled according to multiple factors.
Step 106: if both compressors are in the failure stop state, the control process of the dryer is exited.
After exiting, the process of both compressors being in a fault shutdown state, such as alarming, reporting a repair, etc., may be performed.
When the method of the embodiment is adopted to control the air source heat pump dryer with the parallel dual systems, the state of the external machine of the dryer is judged firstly, and different control processes are executed according to the condition that the compressor in the external machine is in a normal operation state or a fault shutdown state, so that the drying effect of the dryer is ensured as much as possible. In specific control, besides the control of the opening or closing of the compressor by the temperature difference deviation degree formed by the main temperature difference and the auxiliary temperature difference, the control of the opening and closing of the compressor is also carried out according to the shortest running time and the shortest stopping time of the compressor, on one hand, the control of the starting and stopping of the compressor is carried out by the temperature difference deviation degree, the temperature fluctuation range in the drying chamber can be reduced, the drying temperature tends to a stable balance state, the drying effect is further improved, on the other hand, the requirements of the shortest running time and the shortest stopping time of the compressor are considered, the starting and stopping of the compressor are controlled after the requirements are met, the compressor can be fully protected, the phenomenon that the normal operation of the dryer is influenced due to damage or damage caused by frequent starting and stopping of the compressor is avoided, and therefore the reliability and stability of the operation of the dryer are improved.
In order to further improve the more precise control of the two compressors in the dryer and achieve better drying temperature stability and drying effect, in other preferred embodiments, the first control process is implemented by using the flow of fig. 2, and the second control process is implemented by using the flow of fig. 3.
Specifically, FIG. 2 illustrates a flow chart of another embodiment of the first control process.
Step 201: acquiring real-time indoor temperature, setting indoor temperature, main temperature difference and auxiliary temperature difference, and the shortest running time and the shortest shutdown time of the compressor.
The meaning and the obtaining mode of the specific parameters refer to the corresponding description of the embodiment of fig. 1.
Step 202: and summing the main temperature difference and the auxiliary temperature difference to obtain a reference temperature difference. The reference temperature difference is used as an actual temperature difference for compressor control.
Then, the different control from step 203 to step 212 is performed according to the relationship between the real-time indoor temperature and the set indoor temperature, the reference temperature difference, and the relationship of time.
Step 203: the real-time indoor temperature is less than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, and all the compressors with the shortest shutdown time are started.
The first coefficient is a preset known positive number, can be modified through authorization according to actual conditions, and is used for reflecting the proportional relation between the difference value of the real-time indoor temperature and the set indoor temperature and the reference temperature difference, so that the compressor can be accurately adjusted and controlled, and the fluctuation range of the temperature in the drying chamber is reduced.
And under the condition that the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, the real-time indoor temperature is far lower than the set indoor temperature. In this case, to improve the drying speed and drying uniformity, all two compressors will be turned on. And, to protect the compressor, it is the compressor that is turned on all the down time to the minimum required down time. If a certain compressor does not meet the required shortest shutdown time, the compressor is not started temporarily until the shortest shutdown time is met, and then the compressor is started, so that the balance of the compressor protection and the drying performance is considered.
Step 204: the real-time indoor temperature is less than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not more than the product of the reference temperature difference and the first coefficient and is more than the product of the reference temperature difference and the second coefficient, and one of the compressors with the shortest shutdown time is started.
The second coefficient is a preset and known positive number, is smaller than the first coefficient, and can be modified through authorization according to actual conditions to reflect the proportional relation between the difference value of the real-time indoor temperature and the set indoor temperature and the reference temperature difference, so that the compressor can be accurately adjusted and controlled, and the fluctuation range of the drying indoor temperature is reduced.
If the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, the difference between the real-time indoor temperature and the set indoor temperature is small, and the indoor temperature can be quickly stabilized within the required temperature range by using the operation of one compressor. If two compressors are still operated, large fluctuation of temperature is easily generated, and frequent starting and stopping of the compressors are caused. Therefore, in this case, one of the compressors whose downtime reaches the shortest downtime is turned on.
As a preferred real-time mode, the compressor with the shutdown time reaching the shortest shutdown time of the compressor is started, the compressor is started at the fastest speed, heat is conveyed into the drying chamber, and the drying speed is increased.
Step 205: the real-time indoor temperature is less than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not more than the product of the reference temperature difference and the second coefficient, or the real-time indoor temperature is greater than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not more than the product of the reference temperature difference and the second coefficient, and the states of the two compressors are kept unchanged.
When the real-time indoor temperature meets the conditions of the step, the temperature in the drying chamber is stable, and in order to maintain the stability of the indoor temperature, the states of the two compressors are kept unchanged. That is, the compressor in the on operation state continues to maintain the on operation; the compressor, in the off state, also continues to remain in the off state.
Step 206: the real-time indoor temperature is greater than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the second coefficient and is not greater than the product of the reference temperature difference and the first coefficient, and one of the compressors with the shortest running time is closed.
When the real-time indoor temperature meets the condition of the step, the real-time indoor temperature is higher than the set indoor temperature and tends to increase towards higher temperature, so that the phenomenon that the temperature is excessively adjusted to cause large fluctuation is avoided, and the compressor is closed to avoid frequent starting and stopping of the compressor. Moreover, in order to protect the compressors, one of the compressors having the shortest operation time is shut down.
As a preferred real-time approach, the compressor with the down time that first reaches the minimum run time of the compressor is shut down to slow down the rise in indoor temperature at a faster rate.
Step 207: the real-time indoor temperature is greater than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, and all the compressors with the shortest running time are closed.
And under the condition that the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, the real-time indoor temperature far exceeds the set indoor temperature, the drying requirement is met, and all compressors with the shortest running time are closed.
The first control process of the embodiment of fig. 2 is adopted to control the two compressors, so that the better drying temperature stability and drying effect can be achieved on the basis of protecting the compressors as much as possible and improving the operation reliability of the dryer.
In other preferred embodiments, in order to provide the heat required for drying more timely and increase the drying speed, the first control process further includes the following controls:
when the real-time indoor temperature is less than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, if the shutdown time does not reach the shortest shutdown time of the compressor, the compressor is kept closed, the electric heating of the compressor is started simultaneously, the heat generated by the electric heating is used for providing the heat required by drying for the drying chamber, and the drying speed and the drying efficiency are improved. The electrical heating of the compressor is turned off when the compressor reaches the minimum shutdown time, and the compressor is turned on at the same time to reduce the power consumption caused by turning on the electrical heating.
In some other more preferred embodiments, the first control process further includes the following controls:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor with longer shutdown time does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; and starting the compressor when the shutdown time of the compressor reaches the minimum shutdown time, and simultaneously closing an electric heater of the compressor. Compressors with longer shutdowns will reach the minimum shutdown time faster. When the real-time indoor temperature meets the condition that the real-time indoor temperature is smaller than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, the difference between the real-time indoor temperature and the set indoor temperature is not large, and the indoor temperature can be quickly stabilized in the required temperature range by utilizing the running of the compressor with longer shutdown time and the shortest shutdown time. If the compressor does not reach the required minimum shutdown time, the electric heater of the compressor is started, heat generated by electric heating is used for providing heat required by drying for the drying chamber, and the drying speed and the drying efficiency are improved. When the compressor reaches the shortest stop time, the electric heating is closed, and the compressor is opened at the same time, so that the electricity consumption generated by opening the electric heating is reduced.
For the electric heater in each system, in other preferred embodiments, a plurality of independently controlled electric heating units are included, so that the hierarchical control of the plurality of electric heating units is facilitated, the effective utilization and the accurate control of the electric heater are improved, and the drying requirement is met with the minimum electric quantity consumption as possible.
FIG. 3 is a flow chart illustrating another embodiment of the second control process.
As shown in fig. 3, the second control process is implemented by the following method:
step 301: acquiring real-time indoor temperature, setting indoor temperature, main temperature difference and auxiliary temperature difference, and the shortest running time and the shortest shutdown time of the compressor.
The meaning and the obtaining mode of the specific parameters are correspondingly described in the embodiment with reference to fig. 1.
Step 302: and summing the main temperature difference and the auxiliary temperature difference to obtain a reference temperature difference. The reference temperature difference is used as an actual temperature difference for compressor control.
Then, the different control from step 303 to step 306 is performed according to the relationship between the real-time indoor temperature and the set indoor temperature, the reference temperature difference, and the relationship of time.
Step 303: and starting the electric heater corresponding to the compressor in the fault shutdown state when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, and starting the compressor when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time.
The meaning and effect of the first coefficient are described with reference to the embodiment of fig. 2.
And under the condition that the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, the real-time indoor temperature is far lower than the set indoor temperature. In this case, in order to improve the drying speed and drying uniformity, for the compressor in the malfunction stop state, since the heating amount required for drying cannot be provided through the refrigerant circulation system, the electric heater corresponding to the compressor in the malfunction stop state is forcibly turned on, so as to improve the drying efficiency of the dryer. For the compressor in a normal running state, in order to protect the compressor, the compressor is started when the stop time of the compressor reaches the shortest stop time, so that the balance of the protection and drying performance of the compressor is considered.
Step 304: the real-time indoor temperature is less than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not more than the product of the reference temperature difference and the first coefficient and is more than the product of the reference temperature difference and the second coefficient, and the compressor is started when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time.
The second coefficient is a positive number smaller than the first coefficient, and the specific meaning and effect are described with reference to the embodiment of fig. 2.
If the real-time indoor temperature meets the conditions of the step, the difference between the real-time indoor temperature and the set indoor temperature is not large, and the compressor is started when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time.
In this step, if the real-time indoor temperature after the start-up meets the conditions of this step, the electric heater of the compressor in the fault shutdown state may not be turned on; if the real-time indoor temperature is increased after the control of step 303 to reach the condition of the step, the on state may be maintained in the step since the electric heater of the compressor in the failed state is already turned on in step 303.
Step 305: the real-time indoor temperature is smaller than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, or the real-time indoor temperature is larger than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient, and the state of the compressor in the normal running state is kept unchanged.
When the real-time indoor temperature meets the conditions of the step, the temperature in the drying chamber is stable, and in order to maintain the stability of the indoor temperature, the state of the compressor in the normal operation state is unchanged. That is, if the compressor is in the on-operation state, the on-operation is continuously maintained; if the compressor is in the off state, the off state is also continuously maintained.
Step 306: the real-time indoor temperature is greater than the set indoor temperature, the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, and the compressor is closed when the running time of the compressor in the normal running state reaches the shortest running time.
And under the condition that the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and the first coefficient, the real-time indoor temperature far exceeds the set indoor temperature, the drying requirement is met, and the compressor with the shortest running time is closed. Meanwhile, if the electric heater of the compressor in the failed shutdown state is in an on state, the electric heater is also turned off.
The second control process of the embodiment of fig. 3 is adopted to control the electric heaters corresponding to the compressor in the normal operation state and the compressor in the fault shutdown state, so that the better drying temperature stability and drying effect can be achieved on the basis of protecting the compressor as much as possible and improving the operation reliability of the dryer.
In some other preferred embodiments, in order to provide the heat required for drying more timely and increase the drying speed, the second control process further includes the following controls:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, if the stop time of the compressor in the normal running state does not reach the shortest stop time of the compressor, the compressor is kept to be closed, meanwhile, the electric heater of the compressor is started, heat generated by electric heating is used for providing heat required by drying for the drying chamber, and the drying speed and the drying efficiency are improved. The electrical heating of the compressor is turned off when the compressor reaches the minimum shutdown time, and the compressor is turned on at the same time to reduce the power consumption caused by turning on the electrical heating.
In some other more preferred embodiments, the second control process further includes the following controls:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor in the normal running state does not reach the shortest shutdown time of the compressor, the compressor is kept to be closed, and meanwhile, an electric heater of the compressor is started; and when the shortest shutdown time is reached, the compressor is started, and the electric heater of the compressor and the electric heater corresponding to the compressor in the fault shutdown state are simultaneously closed. If the compressor in the normal operation state does not reach the required minimum shutdown time, the electric heater of the compressor is started, heat generated by electric heating is used for providing heat required by drying for the drying chamber, and the drying speed and the drying efficiency are improved. When the compressor reaches the shortest stop time, the compressor is started, and the electric heater of the compressor and the electric heater corresponding to the compressor in the fault stop state are closed at the same time, so that the electricity consumption generated by starting the electric heater is reduced.
In other preferred embodiments, the dryer is further provided with a generator, and after determining that the compressor is in the fault-down state, the control method further includes determining a fault type and performing a process of supplying power in different manners according to the fault type. Specifically, whether the fault is a power failure fault is judged; if the compressor is in power failure, the generator is controlled to supply power to the electric heater corresponding to the compressor which is in power failure shutdown, so that the electric heater is ensured to be started to work smoothly; if the power failure is not the power failure, the power supply of the dryer which is stopped in the power failure is used for supplying power to the electric heater.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. A method for controlling an air source heat pump dryer having a dual system in parallel, the dryer including two compressors, the method comprising:
judging whether the compressor is in a normal operation state or a fault shutdown state;
if the two compressors are in a normal running state, executing a first control process;
if one compressor is in a normal operation state and the other compressor is in a fault shutdown state, executing a second control process;
the first control process includes:
controlling the opening or closing of the two compressors according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest running time of each compressor and the shortest stopping time of each compressor;
the second control process includes:
controlling the opening or closing of the compressor in a normal operation state according to the real-time indoor temperature, the set indoor temperature, the main temperature difference, the auxiliary temperature difference, the shortest operation time of the compressor and the shortest shutdown time of the compressor;
the first control process specifically includes:
summing the main temperature difference and the auxiliary temperature difference to obtain a reference temperature difference;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, starting all the compressors with the shortest shutdown time; the first coefficient is a positive number;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, starting one of the compressors with the shortest shutdown time; the second coefficient is a positive number less than the first coefficient;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, or when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, the states of the two compressors are kept unchanged;
when the real-time indoor temperature is greater than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is greater than the product of the reference temperature difference and a second coefficient and is not greater than the product of the reference temperature difference and the first coefficient, one of the compressors with the shortest running time is closed;
when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is higher than the product of the reference temperature difference and the first coefficient, all the compressors with the shortest running time are closed;
the second control process specifically includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, starting an electric heater corresponding to the compressor in the fault shutdown state, and starting the compressor when the shutdown time of the compressor in the normal operation state reaches the shortest shutdown time;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, starting the compressor when the shutdown time of the compressor in the normal running state reaches the shortest shutdown time;
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the second coefficient, or when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient, the state of the compressor in the normal operation state is kept unchanged;
when the real-time indoor temperature is higher than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is higher than the product of the reference temperature difference and the first coefficient, the compressor is closed when the running time of the compressor in the normal running state reaches the shortest running time;
the main difference in temperature with supplementary difference in temperature is the known value, the main difference in temperature with supplementary difference in temperature constitutes the difference in temperature degree of departure, is right the used difference in temperature value is controlled to the compressor.
2. The control method of an air source heat pump dryer having parallel dual systems as claimed in claim 1, wherein said first control process further comprises:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, if the stop time does not reach the shortest stop time of the compressor, the compressor is kept closed, and meanwhile, the electric heating of the compressor is started; the electrical heating of the compressor is turned off when the minimum shutdown time is reached, while the compressor is turned on.
3. The control method of an air source heat pump dryer having parallel dual systems as claimed in claim 1, wherein, in the first control process,
the starting of one of the compressors with the shortest shutdown time is specifically as follows: starting the compressor with the shutdown time reaching the shortest shutdown time of the compressor firstly;
the step of turning off one of the compressors with the shortest operation time includes: the compressor whose operation time reaches the shortest operation time of the compressor first is turned off.
4. The control method of an air source heat pump dryer having parallel dual systems as claimed in claim 1, wherein the first control process further comprises:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor with longer shutdown time does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; and turning on the compressor when the shutdown time of the compressor reaches the minimum shutdown time, and simultaneously turning off the electric heater of the compressor.
5. The control method of the air source heat pump dryer having the parallel dual system according to any one of claims 1 to 4, wherein the second control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is larger than the product of the reference temperature difference and the first coefficient, if the shutdown time of the compressor in the normal running state does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; the electric heater of the compressor is turned off when the minimum shutdown time is reached, while the compressor is turned on.
6. The control method of an air source heat pump dryer having a parallel dual system according to any one of claims 1 to 4, wherein the second control process further includes:
when the real-time indoor temperature is lower than the set indoor temperature and the absolute value of the difference between the real-time indoor temperature and the set indoor temperature is not larger than the product of the reference temperature difference and the first coefficient and is larger than the product of the reference temperature difference and the second coefficient, if the shutdown time of the compressor in the normal running state does not reach the shortest shutdown time of the compressor, the compressor is kept closed, and meanwhile, an electric heater of the compressor is started; and when the shortest shutdown time is reached, the compressor is started, and the electric heater of the compressor and the electric heater corresponding to the compressor in the fault shutdown state are closed at the same time.
7. The method of controlling an air source heat pump dryer having a parallel dual system as claimed in any one of claims 1 to 4, wherein said dryer further includes a generator, and after determining that the compressor is in said malfunction stop state, said method further comprises:
judging whether the fault is a power failure fault or not;
if so, controlling the generator to supply power to the electric heater corresponding to the compressor which is in the fault shutdown state;
if not, the power supply of the dryer which is shut down due to the fault is used for supplying power to the electric heater of the dryer.
8. The control method of the air source heat pump dryer with the parallel dual system as claimed in any one of claims 1 to 4, wherein the electric heater comprises a plurality of independently controlled electric heating units.
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