CN111076530B - Multi-connected heat pump drying control method and device and multi-connected heat pump drying unit - Google Patents
Multi-connected heat pump drying control method and device and multi-connected heat pump drying unit Download PDFInfo
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- CN111076530B CN111076530B CN201911255130.9A CN201911255130A CN111076530B CN 111076530 B CN111076530 B CN 111076530B CN 201911255130 A CN201911255130 A CN 201911255130A CN 111076530 B CN111076530 B CN 111076530B
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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
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Abstract
The application relates to a multi-connected heat pump drying control method and device and a multi-connected heat pump drying unit, and belongs to the technical field of heat pump drying control. The application includes: acquiring the starting number ratio of drying terminals, acquiring the temperature of a drying space corresponding to each drying terminal in operation, and acquiring time-temperature control parameters corresponding to objects to be dried; obtaining the output frequency of a heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and time-temperature control parameters; and controlling the heat pump compressor to operate according to the output frequency. Through this application, help realizing the dynamic balance of heat pump compressor output and many stoving rooms demand, help making each roast room satisfy the requirement that all satisfies the stoving technology, and then help guaranteeing the stoving quality in each stoving room.
Description
Technical Field
The application belongs to the technical field of heat pump drying control, and particularly relates to a multi-connected heat pump drying control method and device and a multi-connected heat pump drying unit.
Background
The heat pump drying unit can be applied to the drying and dehydration of food, medicinal materials, wood, agricultural and sideline products, industrial products and the like, specifically places the objects to be dried in the drying room, conveys hot air to the drying room through the heat pump drying unit, takes away the moisture in the objects to be dried, and achieves the purpose of drying.
In specific application, a common heat pump drying unit is configured by configuring an outdoor unit and an indoor unit, and one common heat pump drying unit is only used for drying in one drying room. For the connected drying room group, if a common heat pump drying unit is adopted, how many common heat pump drying units are needed to be configured for how many drying rooms, and obviously, the outdoor opportunity configured for each common heat pump drying unit can increase the purchase cost, the land occupation cost and the like. For the problems, the multi-connected heat pump drying unit can be used for better solving the problems, the multi-connected heat pump drying unit is configured by arranging a plurality of indoor units on one outdoor unit, each indoor unit correspondingly acts on one drying room, and the purpose that one outdoor unit drives the plurality of indoor units to dry a plurality of drying rooms under the drying room group can be realized.
From the aspect of comprehensive cost, under the condition of a drying room group, a multi-connected heat pump drying unit is a better choice. However, it should be considered that, when the multi-connected heat pump drying unit is applied to a group of drying rooms, it is difficult for a user to observe the state of each drying room at the same time, and after the user adjusts the drying end of a certain drying room, the situation that the user pulls one to move the whole body may be caused, which may affect other drying rooms, but the user cannot know in time. Therefore, in the case of applying the multiple heat pump dryer group to the drying room group, the automatic control of the multiple heat pump dryer group is a preferable option, and similarly, the above-mentioned problem is also considered in the automatic control of the multiple heat pump dryer group.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides a multi-connected heat pump drying control method and device and a multi-connected heat pump drying unit, which are beneficial to realizing the dynamic balance between the output of a heat pump compressor and the requirements of multiple drying rooms.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect,
the application provides a multi-connected heat pump drying control method, which comprises the following steps:
acquiring the starting number ratio of drying terminals, acquiring the temperature of a drying space corresponding to each drying terminal in operation, and acquiring time-temperature control parameters corresponding to objects to be dried;
obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
and controlling the heat pump compressor to operate according to the output frequency.
Further, the obtaining of the output frequency of the heat pump compressor according to the ratio of the starting-up number, the temperature of the drying space corresponding to each drying end in operation, and the time-temperature control parameter includes:
calculating the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and a target temperature, wherein the target temperature is obtained through the time-temperature control parameters, the time-temperature control parameters form a plurality of control stages, and each control stage corresponds to one target temperature;
obtaining a first variable and a second variable according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the first variable is a statistical value obtained according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the second variable is the difference value between the maximum value and the minimum value in the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature;
generating a first combination result by combining the first variable and a calculation constant, and generating a second combination result by combining the second variable and the ratio of the boot number, wherein the calculation constant is obtained by the slope of a time-temperature control line formed by the time-temperature control parameter in each control stage;
and obtaining the output frequency according to the first combination result and the second combination result.
Further, the obtaining of the output frequency of the heat pump compressor according to the ratio of the starting-up number, the temperature of the drying space corresponding to each drying end in operation, and the time-temperature control parameter specifically includes:
using a preset formula:
calculating to obtain the output frequency of the heat pump compressor;
wherein the content of the first and second substances,
h is the output frequency;
α is the calculation constant;
ΔTais the first variable;
delta is the ratio of the starting number;
ΔTmax-ΔTminis the second variable, where Δ TmaxFor each drying end in operation, the maximum value of the temperature difference between the temperature of the corresponding drying space and the target temperature is delta TminThe minimum value of the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature is obtained.
Further, the obtaining of the first variable comprises:
determining the maximum value and the minimum value from the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature, and excluding the maximum value and the minimum value;
and calculating to obtain the first variable according to the residual temperature differences after elimination.
Further, the statistical values include:
at least one of a mode, a median, or an average.
Further, the method further comprises:
acquiring the operating frequency of a heat pump compressor, and acquiring the operating condition of each drying tail end in operation and the temperature of a corresponding drying space;
and performing correction control on each drying tail end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying tail end in operation and the temperature of the corresponding drying space.
Further, the performing correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation and the temperature of the corresponding drying space includes:
using a preset formula:
correcting and controlling the fan frequency of each drying tail end in operation;
wherein the content of the first and second substances,
Fithe frequency of a fan at the ith drying end in operation;
epsilon is a correction coefficient;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space.
Further, the performing correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation and the temperature of the corresponding drying space includes:
using a preset formula:
correcting and controlling the opening of a throttle valve at each drying tail end in operation;
wherein the content of the first and second substances,
Vithe throttle valve opening degree of the ith drying end in operation;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space is obtained;
ΔT″′ito runThe variation amount of the evaporation temperature of the ith drying end in (1).
In a second aspect of the present invention,
the application provides a multiple heat pump drying control device, includes:
the first acquisition module is used for acquiring the starting number ratio of the drying tail ends, acquiring the temperature of the drying space corresponding to each drying tail end in operation and acquiring the time-temperature control parameter corresponding to the object to be dried;
the obtaining module is used for obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
and the first control module is used for controlling the heat pump compressor to operate according to the output frequency.
In a third aspect,
the application provides a multiple heat pump drying unit, includes:
a memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of any of the above methods.
This application adopts above technical scheme, possesses following beneficial effect at least:
this application utilizes the terminal start-up quantity of stoving to account for than, and the temperature difference between the temperature and the target temperature in the corresponding stoving space of each stoving end in operation, obtains heat pump compressor's output frequency to this operation of controlling heat pump compressor helps realizing the dynamic balance of heat pump compressor output and many stoving room demands, helps making each roast room satisfy the requirement that all satisfies the stoving technology, and then helps guaranteeing the stoving quality in each stoving room.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a multiple heat pump drying control method according to an exemplary embodiment;
FIG. 2 is a schematic diagram of a time-temperature control line for a chrysanthemum shown in accordance with an exemplary embodiment;
FIG. 3 is a flow chart illustrating a multiple heat pump drying control method according to another exemplary embodiment;
fig. 4 is a schematic structural diagram illustrating a multiple heat pump drying control apparatus according to an exemplary embodiment;
fig. 5 is a schematic structural diagram illustrating a multiple heat pump dryer group according to an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart illustrating a multiple heat pump drying control method according to an exemplary embodiment, as shown in fig. 1, the method includes the following steps:
step S101, obtaining the ratio of the starting-up number of the drying terminals, obtaining the temperature of the drying space corresponding to each drying terminal in operation, and obtaining the time-temperature control parameter corresponding to the object to be dried.
Step S102, obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
and step S103, controlling the heat pump compressor to operate according to the output frequency.
Specifically, the method is applied to a multi-connected heat pump drying unit, the multi-connected heat pump drying unit is configured by configuring a plurality of indoor units with one outdoor unit, each indoor unit correspondingly acts on one drying room, and the drying of the plurality of drying rooms by the plurality of indoor units driven by the one outdoor unit can be realized.
The application of chrysanthemum as the matter to be dried is explained below. In practical application, when the amount of chrysanthemum is large, all the drying rooms are used, and correspondingly, all the indoor machines are started by the multi-connected heat pump drying unit, and when the amount of chrysanthemum is small, part of the drying rooms are used, and correspondingly, part of the indoor machines are started by the multi-connected heat pump drying unit. In practical application, the multi-connected heat pump drying unit can be provided with a temperature detection sensor in each drying room, and the temperature T of the corresponding drying room is obtained according to the opened drying tail end1、T2。。。Tn。
Obtaining the ratio of the starting-up quantity according to the ratio of the number of the started drying tail ends to the total number of the drying tail ends configured by the multi-connected heat pump drying unit, wherein the specific formula is as follows: and δ is N/N, wherein δ is the ratio of the starting-up number of the drying ends, N is the number of the opened drying ends, and N is the total number of the drying ends configured by the multi-connected heat pump drying unit.
Fig. 2 is a schematic diagram of a time-temperature control line of a chrysanthemum according to an exemplary embodiment, as shown in fig. 2, fig. 2 shows a plurality of continuous control stages of chrysanthemum drying (some stages need temperature rise control and other stages need temperature maintenance control), and the output frequency of a heat pump compressor is obtained by the ratio of the number of start-up ends of the drying ends, the temperature of a drying space corresponding to each drying end in operation, and time-temperature control parameters, so as to control the heat pump compressor to operate according to the output frequency, which is helpful for realizing the dynamic balance between the output of the heat pump compressor and the requirements of a plurality of drying rooms, and is helpful for enabling each drying room to satisfy the requirements of a drying process, thereby being helpful for ensuring the drying quality of each drying room.
In one embodiment, the obtaining the output frequency of the heat pump compressor according to the ratio of the number of starts, the temperature of the drying space corresponding to each drying end in operation, and the time-temperature control parameter includes:
calculating the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and a target temperature, wherein the target temperature is obtained through the time-temperature control parameters, the time-temperature control parameters form a plurality of control stages, and each control stage corresponds to one target temperature;
obtaining a first variable and a second variable according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the first variable is a statistical value obtained according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the second variable is the difference value between the maximum value and the minimum value in the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature;
combining the first variable with a calculation constant to generate a first combined result, wherein the calculation constant is obtained by the slope of a time-temperature control line formed by the time-temperature control parameter in each control stage; generating a second combination result by combining the ratio of the second variable to the starting number;
and obtaining the output frequency according to the first combination result and the second combination result.
Specifically, as shown in fig. 2, fig. 2 is a specific graphical illustration showing time-temperature control parameters of chrysanthemum drying, fig. 2 shows a plurality of control stages, and a corresponding target temperature can be obtained according to each control stage, and a calculation constant combined with a first variable can be obtained according to the slope of a control line of each control stage. In specific application, when the multi-connected heat pump drying unit operates to one control stage, the corresponding target temperature and the calculation constant are obtained. Calculating the temperature between the temperature of each drying end corresponding to the drying space and the target temperatureThe temperature difference of (A) is as follows: delta T1＝|Ttar-T1|、ΔT2＝|Ttar-T2|。。。ΔTn＝|Ttar-TnL, where TtarIs a target temperature, T1、T2。。。TnFor each drying end in operation, corresponding to the temperature of the drying space, Δ T1、ΔT2。。。ΔTnThe temperature difference between the temperature of the drying space and the target temperature corresponds to each drying tail end in operation. According to the scheme, a first variable and a second variable are obtained according to the temperature difference between the temperature of the drying space corresponding to each drying end in operation and the target temperature, then the first variable is combined with a calculation constant to obtain a first combination result, the second variable is combined with the proportion of the starting quantity to obtain a second combination result, and the output frequency of the heat pump compressor is obtained according to the first combination result and the second combination result, so that the output control of the heat pump compressor according to the output frequency is related to a time-temperature control line of the object to be dried, the drying characteristic of the object to be dried is more favorably and comprehensively matched with the output of the heat pump compressor, and the drying quality of each drying room is favorably ensured.
The above embodiments are further illustrated by the following specific examples.
In one embodiment, the obtaining the output frequency of the heat pump compressor according to the ratio of the number of starts, the temperature of the drying space corresponding to each drying end in operation, and the time-temperature control parameter specifically includes:
using a preset formula:
calculating to obtain the output frequency of the heat pump compressor;
wherein the content of the first and second substances,
h is the output frequency;
α is the calculation constant;
ΔTais the first variable;
delta is the ratio of the starting number;
ΔTmax-ΔTminis the second variable, where Δ TmaxFor each drying end in operation, the maximum value of the temperature difference between the temperature of the corresponding drying space and the target temperature is delta TminThe minimum value of the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature is obtained;
α(ΔTa)3as a result of the first bonding;
Further, the obtaining of the first variable comprises:
determining the maximum value and the minimum value from the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature, and excluding the maximum value and the minimum value;
and calculating to obtain the first variable according to the residual temperature differences after elimination.
Further, the statistical values include:
at least one of a mode, a median, or an average.
Fig. 3 is a flowchart illustrating a multiple heat pump drying control method according to another exemplary embodiment, as shown in fig. 3, the method includes the steps of:
step S301, acquiring the ratio of the starting-up number of drying terminals, acquiring the temperature of a drying space corresponding to each drying terminal in operation, and acquiring time-temperature control parameters corresponding to the dried objects;
step S302, obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
and step S303, controlling the heat pump compressor to operate according to the output frequency.
S304, acquiring the operating frequency of a heat pump compressor, and acquiring the operating condition of each drying tail end in operation and the temperature of a corresponding drying space;
and S305, performing correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation and the temperature of the corresponding drying space.
The steps S301 to S303 have already been described in the related embodiments, and are not described herein again.
Through the steps S301 to S303, the dynamic balance between the output of the heat pump compressor and the requirements of the multiple drying rooms is facilitated under the control of the operating frequency of the heat pump compressor. On this basis, through steps S304 to S305, the drying terminals are optimally corrected and controlled according to the difference requirements of the drying spaces, which is helpful to further improve the drying effect of the drying spaces.
After the multi-connected heat pump drying unit performs drying operation, each drying tail end in operation performs hot air supply drying on a corresponding drying space, in practical application, due to different lengths of refrigerant conveying flow paths of the drying tail ends and the like, the drying tail ends can have more or less difference, and meanwhile, due to different layouts, environments and the like of the drying spaces, the drying spaces can have more or less difference. The operating conditions of the drying ends and the temperatures of the corresponding drying spaces acquired by the multi-connected heat pump drying unit during operation are different, so that the drying ends during operation need to be corrected and controlled accordingly.
The following will further describe the correction control for each drying end in operation, with reference to step S305.
In one embodiment, the performing correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation, and the temperature of the corresponding drying space includes:
using a preset formula:
correcting and controlling the fan frequency of each drying tail end in operation;
wherein the content of the first and second substances,
Fithe frequency of a fan at the ith drying end in operation;
epsilon is a correction coefficient;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
delta H is the variation of the operating frequency of the heat pump compressor, and can be specifically 0-t0A change in operating frequency over a period of time;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation can be specifically 0-t0A change in temperature over a period of time;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space.
Above-mentioned embodiment scheme is to drying the terminal stoving air supply volume of each stoving in service and controls, can give the air supply volume that corresponds more suitable in the stoving space, improves the stoving effect.
In another embodiment, the performing correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation, and the temperature of the corresponding drying space includes:
using a preset formula:
correcting and controlling the opening of a throttle valve at each drying tail end in operation;
wherein the content of the first and second substances,
Vithe throttle valve opening degree of the ith drying end in operation;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
delta H is the variation of the operating frequency of the heat pump compressor, and can be specifically 0-t0A change in operating frequency over a period of time;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation can be specifically 0-t0A change in temperature over a period of time;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space is obtained;
ΔT″′ithe variation of the evaporation temperature of the ith drying end in operation can be specifically 0-t0The amount of change in the evaporation temperature over a period of time.
In the scheme of the embodiment, the opening degree of the throttle valve of each drying tail end in operation is controlled, and the drying tail end is provided with the condenser at the air outlet position to heat the outlet air which is used as the drying air to be sent into the drying space; an evaporator is arranged at the return air position to dehumidify the return air. Through the scheme of the embodiment, the corresponding throttle valve required opening degree can be calculated, and the most suitable indoor evaporation temperature can be given, so that the drying hot air output curve at the drying tail end is balanced.
In a specific application, the control of the drying air supply amount and the control of the opening degree of the throttle valve can be simultaneously adopted to obtain a better drying effect.
Fig. 4 is a schematic structural diagram illustrating a multiple heat pump drying control device according to an exemplary embodiment, where as shown in fig. 4, the multiple heat pump drying control device 4 includes:
a first obtaining module 401, configured to obtain a ratio of the number of started drying terminals, obtain a temperature of a drying space corresponding to each drying terminal in operation, and obtain a time-temperature control parameter corresponding to an object to be dried;
an obtaining module 402, configured to obtain an output frequency of the heat pump compressor according to the startup number ratio, the temperature of the drying space corresponding to each drying end in operation, and the time-temperature control parameter;
a first control module 403 for controlling the heat pump compressor to operate at the output frequency.
Further, the obtaining module 402 is specifically configured to:
calculating the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and a target temperature, wherein the target temperature is obtained through the time-temperature control parameters, the time-temperature control parameters form a plurality of control stages, and each control stage corresponds to one target temperature;
obtaining a first variable and a second variable according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the first variable is a statistical value obtained according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the second variable is the difference value between the maximum value and the minimum value in the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature;
combining the first variable with a calculation constant to generate a first combined result, wherein the calculation constant is obtained by the slope of a time-temperature control line formed by the time-temperature control parameter in each control stage; generating a second combination result by combining the ratio of the second variable to the starting number;
and obtaining the output frequency according to the first combination result and the second combination result.
Further, the obtaining module 402 is specifically configured to:
using a preset formula:
calculating to obtain the output frequency of the heat pump compressor;
wherein the content of the first and second substances,
h is the output frequency;
α is the calculation constant;
ΔTais the first variable;
delta is the ratio of the starting number;
ΔTmax-ΔTminis the second variable, where Δ TmaxFor each drying end in operation, the maximum value of the temperature difference between the temperature of the corresponding drying space and the target temperature is delta TminThe minimum value of the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature is obtained.
Further, the obtaining of the first variable comprises:
determining the maximum value and the minimum value from the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature, and excluding the maximum value and the minimum value;
and calculating to obtain the first variable according to the residual temperature differences after elimination.
Further, the statistical values include:
at least one of a mode, a median, or an average.
Further, the multi-connected heat pump drying control device 3 further includes:
a second obtaining module 404, configured to obtain an operating frequency of the heat pump compressor, and obtain an operating condition of each drying end in operation and a temperature of a corresponding drying space;
and the second control module 405 is configured to perform correction control on each drying end according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation, and the temperature of the corresponding drying space.
Further, the second control module 405 is specifically configured to:
using a preset formula:
correcting and controlling the fan frequency of each drying tail end in operation;
wherein the content of the first and second substances,
Fithe frequency of a fan at the ith drying end in operation;
epsilon is a correction coefficient;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space.
Further, the second control module 405 is specifically configured to:
using a preset formula:
correcting and controlling the opening of a throttle valve at each drying tail end in operation;
wherein the content of the first and second substances,
Vithe throttle valve opening degree of the ith drying end in operation;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space is obtained;
ΔT″′iis the variation of the evaporating temperature of the ith drying end in operation.
With regard to the multi-connected heat pump drying control device 4 in the above-described related embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
Fig. 5 is a schematic structural diagram illustrating a multiple heat pump dryer group according to an exemplary embodiment, where, as shown in fig. 5, the multiple heat pump dryer group 5 includes:
a memory 501 on which an executable program is stored;
a processor 502 for executing the executable program in the memory 501 to implement the steps of any of the above methods.
With respect to the multi-connected heat pump dryer group 5 in the above embodiment, the specific manner of executing the program in the memory 501 by the processor 502 has been described in detail in the embodiment related to the method, and will not be elaborated herein.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. A drying control method for a multi-connected heat pump is characterized by comprising the following steps:
acquiring the starting number ratio of drying terminals, acquiring the temperature of a drying space corresponding to each drying terminal in operation, and acquiring time-temperature control parameters corresponding to objects to be dried;
obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
controlling the heat pump compressor to operate according to the output frequency;
the obtaining of the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter comprises:
calculating the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and a target temperature, wherein the target temperature is obtained through the time-temperature control parameters, the time-temperature control parameters form a plurality of control stages, and each control stage corresponds to one target temperature;
obtaining a first variable and a second variable according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the first variable is a statistical value obtained according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the second variable is the difference value between the maximum value and the minimum value in the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature;
generating a first combination result by combining the first variable and a calculation constant, and generating a second combination result by combining the second variable and the ratio of the boot number, wherein the calculation constant is obtained by the slope of a time-temperature control line formed by the time-temperature control parameter in each control stage;
obtaining the output frequency according to the first combination result and the second combination result;
the obtaining of the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying end in operation and the time-temperature control parameter specifically comprises:
using a preset formula:
calculating to obtain the output frequency of the heat pump compressor;
wherein the content of the first and second substances,
h is the output frequency;
α is the calculation constant;
ΔTais the first variable;
delta is the ratio of the starting number;
ΔTmax-ΔTminis the second variable, where Δ TmaxThe temperature of the drying space corresponds to each drying end in operationMaximum value of the temperature difference between the target temperature and the target temperature, Delta TminThe minimum value of the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature is obtained.
2. The method of claim 1, wherein obtaining the first variable comprises:
determining the maximum value and the minimum value from the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature, and excluding the maximum value and the minimum value;
and calculating to obtain the first variable according to the residual temperature differences after elimination.
3. The method of claim 1, wherein the statistical values comprise:
at least one of a mode, a median, or an average.
4. The method of claim 1, further comprising:
acquiring the operating frequency of a heat pump compressor, and acquiring the operating condition of each drying tail end in operation and the temperature of a corresponding drying space;
and performing correction control on each drying tail end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying tail end in operation and the temperature of the corresponding drying space.
5. The method of claim 4, wherein the performing the correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation and the temperature of the corresponding drying space comprises:
using a preset formula:
correcting and controlling the fan frequency of each drying tail end in operation;
wherein the content of the first and second substances,
Fithe frequency of a fan at the ith drying end in operation;
epsilon is a correction coefficient;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ithe variation of the temperature of the drying space corresponding to the ith drying end in operation;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space.
6. The method of claim 4, wherein the performing the correction control on each drying end in operation according to the operation frequency of the heat pump compressor, the operation condition of each drying end in operation and the temperature of the corresponding drying space comprises:
using a preset formula:
correcting and controlling the opening of a throttle valve at each drying tail end in operation;
wherein the content of the first and second substances,
Vithe throttle valve opening degree of the ith drying end in operation;
Qithe load of the ith drying end in operation;
QTthe total load of all drying terminals in operation;
0～t0is a period of time;
Δ H is the variation of the operating frequency of the heat pump compressor;
ΔT′ifor the ith drying end in operation to correspondingly dryThe amount of change in temperature of the dry space;
ΔT″ithe temperature difference between the outlet air temperature of the ith drying end in operation and the temperature of the corresponding drying space is obtained;
ΔT″′iis the variation of the evaporating temperature of the ith drying end in operation.
7. The utility model provides a multiple heat pump stoving controlling means which characterized in that includes:
the first acquisition module is used for acquiring the starting number ratio of the drying tail ends, acquiring the temperature of the drying space corresponding to each drying tail end in operation and acquiring the time-temperature control parameter corresponding to the object to be dried;
the obtaining module is used for obtaining the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter;
the first control module is used for controlling the heat pump compressor to operate according to the output frequency;
the obtaining of the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying tail end in operation and the time-temperature control parameter comprises:
calculating the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and a target temperature, wherein the target temperature is obtained through the time-temperature control parameters, the time-temperature control parameters form a plurality of control stages, and each control stage corresponds to one target temperature;
obtaining a first variable and a second variable according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the first variable is a statistical value obtained according to the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature; the second variable is the difference value between the maximum value and the minimum value in the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature;
generating a first combination result by combining the first variable and a calculation constant, and generating a second combination result by combining the second variable and the ratio of the boot number, wherein the calculation constant is obtained by the slope of a time-temperature control line formed by the time-temperature control parameter in each control stage;
obtaining the output frequency according to the first combination result and the second combination result;
the obtaining of the output frequency of the heat pump compressor according to the starting number ratio, the temperature of the drying space corresponding to each drying end in operation and the time-temperature control parameter specifically comprises:
using a preset formula:
calculating to obtain the output frequency of the heat pump compressor;
wherein the content of the first and second substances,
h is the output frequency;
α is the calculation constant;
ΔTais the first variable;
delta is the ratio of the starting number;
ΔTmax-ΔTminis the second variable, where Δ TmaxFor each drying end in operation, the maximum value of the temperature difference between the temperature of the corresponding drying space and the target temperature is delta TminThe minimum value of the temperature difference between the temperature of the drying space corresponding to each drying tail end in operation and the target temperature is obtained.
8. The utility model provides a multiple heat pump drying unit which characterized in that includes:
a memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of the method of any one of claims 1-6.
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