CN116358285A - Multi-connected heat pump drying unit - Google Patents

Multi-connected heat pump drying unit Download PDF

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Publication number
CN116358285A
CN116358285A CN202310115010.9A CN202310115010A CN116358285A CN 116358285 A CN116358285 A CN 116358285A CN 202310115010 A CN202310115010 A CN 202310115010A CN 116358285 A CN116358285 A CN 116358285A
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China
Prior art keywords
heat pump
output frequency
indoor unit
unit
correction coefficient
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CN202310115010.9A
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Chinese (zh)
Inventor
赵玉斌
耿延凯
孙恺
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202310115010.9A priority Critical patent/CN116358285A/en
Publication of CN116358285A publication Critical patent/CN116358285A/en
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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
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • 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
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/172—Speeds of the condenser fan
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a multi-connected heat pump drying unit, comprising: a plurality of indoor units configured to communicate with the plurality of drying chambers, respectively; a plurality of circulation fans respectively configured for a plurality of indoor units for driving an air flow passing through the indoor units to be introduced into the drying chamber by the circulation fans; the outdoor unit is configured to be connected with each indoor unit through a refrigerant pipeline; the processing unit is configured to acquire the output frequency of the heat pump compressor in the outdoor unit according to a preset calculation rule based on the starting number of the indoor units in each starting state, the matching number of the indoor units in each starting state, the dry bulb temperature difference correction coefficient in the corresponding drying chamber of each indoor unit in each starting state, the wind gear correction coefficient of the corresponding circulating fan in each indoor unit in each starting state, the outdoor temperature correction coefficient and the exhaust pressure correction coefficient of the heat pump compressor; and controlling the heat pump compressor to operate according to the output frequency. The invention is helpful for realizing the dynamic balance of the output of the heat pump compressor and the requirement of multiple drying chambers.

Description

Multi-connected heat pump drying unit
Technical Field
The invention relates to the technical field of air source heat pump drying, in particular to a multi-connected heat pump drying unit.
Background
The heat pump drying unit can be applied to the drying and dehydration of foods, medicinal materials, wood, agricultural and sideline products, industrial products and the like, and particularly places the to-be-dried object in a drying room, and conveys hot air into the drying room through the heat pump drying unit, so that moisture in the to-be-dried object is taken away, and the purpose of drying is realized.
In specific application, referring to fig. 1 and 2, a common heat pump dryer unit is generally configured such that an outdoor unit is configured with an indoor unit, and a set of common heat pump dryer units is only used for drying in a drying room. For the drying room group with connected sheets, if the common heat pump drying units are adopted, how many sets of common heat pump drying units (in fig. 2, A1 to A6 respectively represent indoor units, and B1 to B6 respectively represent outdoor units) are needed to be configured, and obviously, the outdoor opportunity configured by each set of common heat pump drying units forms an increase in purchasing cost, occupation cost and the like. For the above problems, the multi-connected heat pump dryer unit can be better solved, referring to fig. 3, the multi-connected heat pump dryer unit is configured in such a way that one outdoor unit is provided with a plurality of indoor units (A1 to A6 in fig. 3 respectively represent the indoor units), each indoor unit correspondingly acts on one drying room, and one outdoor unit can drive a plurality of indoor units to dry a plurality of drying rooms under the drying room group.
In terms of comprehensive cost, the adoption of the multi-connected heat pump drying unit is a better choice under the condition of drying room groups. However, it is considered that when the multi-connected heat pump dryer set is applied to the drying room group, it is difficult for the user to observe the state of each drying room at the same time, and after the indoor unit of one drying room is adjusted, the user may draw a whole body, which may affect other drying rooms, but the user cannot know in time. Thus, in the case of applying the multiple heat pump dryer unit to the drying room group, the automatic control of the multiple heat pump dryer unit is a preferable choice, and similarly, the above-described problems are also considered in the aspect of the automatic control of the multiple heat pump dryer unit.
Disclosure of Invention
The invention provides a multi-connected heat pump dryer unit which is beneficial to realizing the dynamic balance of the output of a heat pump compressor and the requirements of multiple drying chambers.
The application provides a multi-connected heat pump drying unit, include:
a plurality of indoor units configured to communicate with the plurality of drying chambers, respectively;
a plurality of circulation fans respectively configured for a plurality of indoor units for driving an air flow passing through the indoor units to be introduced into the drying chamber by the circulation fans;
the outdoor unit is configured to be connected with each indoor unit through a refrigerant pipeline;
the processing unit is configured to acquire the output frequency of the heat pump compressor in the outdoor unit according to a preset calculation rule based on the starting number of the indoor units in each starting state, the matching number of the indoor units in each starting state, the dry bulb temperature difference correction coefficient in the corresponding drying chamber of each indoor unit in each starting state, the wind gear correction coefficient of the corresponding circulating fan in each indoor unit in each starting state, the outdoor temperature correction coefficient and the exhaust pressure correction coefficient of the heat pump compressor;
controlling the heat pump compressor to operate according to the output frequency;
wherein, the difference between the temperature of the dry bulb in the drying chamber and the set temperature of the dry bulb is the temperature difference of the dry bulb.
And determining the output frequency of the compressor based on the number and the number of each starting indoor unit, the dry bulb temperature difference correction coefficient in the drying chamber, the wind gear correction coefficient of the circulating fan, the outdoor environment temperature correction coefficient and the compressor exhaust pressure correction coefficient, wherein the output frequency considers various factors influencing the frequency of the compressor, so that the operation of the heat pump compressor is controlled according to the starting frequency, and the dynamic balance of the output of the heat pump compressor and the requirements of multiple drying rooms is facilitated.
In some embodiments of the present application, the operation of the indoor unit is controlled with the dry-bulb temperature control precision, specifically:
when the temperature difference of dry balls in a drying chamber communicated with the indoor unit is lower than a first preset temperature threshold, the indoor unit is started up in a temperature control mode, and when the temperature difference of the dry balls is higher than a second preset temperature threshold, the indoor unit is stopped in a temperature control mode;
wherein the first preset temperature threshold is less than the second preset temperature threshold.
In some embodiments of the present application, during operation of the heat pump dryer unit, the operating conditions of the indoor units affect the output frequency of the heat pump compressor, and therefore, the output frequency is adjusted based on the operating conditions of each indoor unit
In some embodiments of the present application, in operation of the heat pump dryer unit, adjusting the output frequency based on the operation condition of each indoor unit includes:
when the indoor unit is stopped in a temperature control way, the output frequency is updated by subtracting the frequency required by the indoor unit to be stopped from the current output frequency;
when the indoor unit is started by temperature control, the output frequency is updated by adding the current output frequency to the frequency required by the indoor unit.
The output frequency of the heat pump compressor is related to the number of the startup indoor units, and therefore, when the number of the startup indoor units increases, the output frequency increases, and when the number of the startup indoor units decreases, the output frequency decreases.
In some embodiments of the present application, the frequency Δf of the indoor unit demand is obtained by using the following formula:
△F= KT*Kpd*Khp(k)*Kfan(k)*Kc(k)；
wherein KT is an outdoor temperature correction coefficient, kpd is an exhaust pressure correction coefficient, khp (k) is the number of indoor units, kc (k) is a dry bulb temperature difference correction coefficient corresponding to the indoor units, kfan (k) is a wind gear correction coefficient corresponding to the circulating fans of the indoor units, and k is the serial number of the indoor units.
In some embodiments of the present application, the preset calculation rule is the following formula:
output frequency
Figure SMS_1
；
Wherein k is the serial number of the indoor unit of the starting machine.
In some embodiments of the present application, in operation of the heat pump dryer unit, adjusting the output frequency based on the operation condition of each indoor unit includes:
when the running conditions of all indoor units are normal, the output frequency is adjusted in real time based on the exhaust pressure difference of the heat pump compressor;
wherein the exhaust pressure difference is equal to a difference between the exhaust pressure and a target exhaust pressure.
In some embodiments of the present application, the output frequency is adjusted in real time based on the discharge pressure difference of the heat pump compressor, specifically:
the exhaust pressure is circularly acquired, the output frequency is increased when the exhaust pressure difference reaches below a first preset pressure threshold value, and the output frequency is reduced when the exhaust pressure difference reaches above a second preset pressure threshold value;
wherein the first preset pressure threshold is less than the second preset pressure threshold.
Drawings
FIG. 1 shows a schematic structural diagram of a conventional multi-connected heat pump dryer unit;
FIG. 2 is a schematic diagram showing the structure of an indoor unit in a conventional multi-split heat pump dryer unit;
FIG. 3 illustrates a schematic diagram of a multi-gang heat pump dryer set, according to some embodiments;
FIG. 4 illustrates a schematic diagram of a multi-gang heat pump dryer set determining the output power of a heat pump compressor, according to some embodiments;
FIG. 5 illustrates a control flow diagram for temperature controlled start-up and temperature controlled shut-down of an indoor unit in a multi-gang heat pump dryer unit, according to some embodiments;
FIG. 6 illustrates a schematic diagram of determining an output frequency of a heat pump compressor when a new indoor unit is temperature controlled on in operation of a multi-gang heat pump dryer unit, according to some embodiments;
FIG. 7 illustrates a schematic diagram of determining an output frequency of a heat pump compressor when a new indoor unit temperature controls shut down in operation of a multi-gang heat pump dryer unit, according to some embodiments;
fig. 8 illustrates a schematic diagram of a multi-gang heat pump dryer unit determining an output frequency of a heat pump compressor when each indoor unit is operating normally, according to some embodiments.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Adopt heat pump stoving mode to dry article (e.g. tealeaves, chrysanthemum) in the drying chamber, this application relates to a multi-gang heat pump drying unit, see fig. 3, multi-gang heat pump drying unit includes a plurality of indoor units, a plurality of circulating fan, an off-premises station and processing unit.
One circulating fan corresponds to one indoor unit and corresponds to one drying chamber respectively.
The indoor units are communicated with one outdoor unit through a refrigerant pipeline, and the processing unit is used for determining the output frequency F of the heat engine compressor in the outdoor unit.
Referring to fig. 2, an air inlet and an air outlet are formed in the side wall of the heating chamber corresponding to the drying chamber, and the air inlet and the air outlet are respectively communicated with the drying chamber.
The corresponding circulating fan is arranged in the heating chamber, and the circulating fan is arranged close to the air outlet and is used for leading air flow in the heating chamber into an inlet of the drying chamber through the air outlet by the circulating fan.
And the air flow flowing out from the outlet of the air return drying chamber of the air inlet of the heating chamber.
The indoor unit is arranged in the heating chamber and is positioned below the circulating fan, and air flow flowing in through the air inlet of the heating chamber passes through the indoor unit and is driven by the circulating fan to be sent into the drying chamber through the air outlet.
The air inlet is arranged below the side wall of the heating chamber, and the air outlet is arranged above the side wall of the heating chamber so as to form hot air flow from top to bottom in the drying chamber.
Referring to fig. 3, one outdoor unit and a plurality of indoor units are connected through refrigerant lines to form a heat pump cycle.
The outdoor unit includes a heat pump compressor, an outdoor heat exchanger, and a portion of an outdoor fan, the indoor unit includes a portion of an indoor heat exchanger and an indoor fan, and a throttle device (e.g., a capillary tube or an electronic expansion valve) may be provided in the indoor unit or the outdoor unit.
The heat pump cycle is performed by using a heat pump compressor, a condenser, an expansion valve, and an evaporator.
The utility model discloses a mainly adopt the heat pump heating cycle of many allies oneself with heat pump drying unit to treat the stoving article in the drying chamber and dry.
The low-temperature low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas into a high-temperature high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The working principle of the heat pump heating cycle is as follows: the refrigerant is pressurized by the heat pump compressor to become high-temperature high-pressure gas, the high-temperature high-pressure gas enters the indoor heat exchanger (a condenser at the moment), heat is released by condensation and liquefaction to become liquid, the liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), the liquid refrigerant evaporates and absorbs heat to become low-temperature low-pressure gaseous refrigerant, and the gaseous refrigerant flows back to the compressor for compression after passing through the gas-liquid separator and enters the next cycle.
As shown in fig. 3, six drying chambers (drying chambers 1 to 6) are shown, in actual use, the number of drying chambers can be freely set and the number of drying chambers used to be opened can also be freely set.
The tobacco is used as the object to be dried for application description. In practical application, under the condition that the tobacco is large in quantity, all the plurality of drying chambers are used, correspondingly, the multi-connected heat pump drying unit starts all the plurality of indoor units, and under the condition that the tobacco is small in quantity, part of the drying chambers are used, and correspondingly, the multi-connected heat pump drying unit starts part of the indoor units.
As follows, determining the output frequency of the heat pump compressor in the outdoor unit immediately after start-up to meet the dynamic demand of multiple drying chambers is described.
Referring to fig. 4, a schematic diagram for determining an output frequency F of a heat pump compressor in an outdoor unit is shown.
S1: and obtaining the starting number m of the indoor units needing to be started and the matching number Khp (k) of each indoor unit needing to be started.
Wherein k is the serial number of the indoor unit of the starting machine, k is less than or equal to m, m is more than or equal to 1 and is a natural number.
And opening the indoor unit corresponding to the drying chamber according to the drying chamber used as required.
As described above, referring to fig. 3, if the drying chamber 1 and the drying chamber 2 are used, the indoor units A1 and A2 corresponding to the drying chamber 1 and the drying chamber 2 need to be turned on, and the number m is 2.
The number of the indoor units in the multi-connected heat pump dryer unit is predicted in advance, so that the number of the indoor units started is available.
When the indoor unit A1 is started up as described above, the corresponding number of matches Khp (1) is obtained, and when the indoor unit A2 is started up as described above, the corresponding number of matches Khp (2) is obtained.
S2: and acquiring the dry ball temperature Tdry of the drying chamber and setting the dry ball temperature Tdry_set.
If a plurality of indoor units are started to operate, the dry bulb temperature of the drying chamber corresponding to each indoor unit needs to be acquired and set.
In practical application, the multi-connected heat pump dryer can be provided with temperature detection sensors in each drying chamber, and the dry bulb temperature Tdry in the corresponding drying chamber is obtained according to the indoor unit which is started to operate.
The dry bulb temperature Tdry and the set dry bulb temperature tdry_set of each drying chamber are acquired in order to acquire the dry bulb temperature difference correction coefficient Kc (k) in each drying chamber.
When both the indoor units A1 and A2 are turned on, the dry bulb temperature difference correction coefficient of the drying chamber 1 corresponding to the indoor unit A1 is Kc (1), and the dry bulb temperature difference correction coefficient of the drying chamber 2 corresponding to the indoor unit A2 is Kc (2).
The temperature difference correction coefficient Kc (k) of each drying chamber is a coefficient which is adjusted in the experiment when the object to be dried in the drying chamber is dried.
A data table between the dry-bulb temperature difference Δtdry and the dry-bulb temperature difference correction coefficient Kc (k) may be established in advance.
After the dry-bulb temperature difference Δtdry is actually obtained, the corresponding dry-bulb temperature difference correction coefficient Kc (k) can be obtained by querying the data table.
The dry-bulb temperature difference Δtdry is a difference between the dry-bulb temperature Tdry and the set dry-bulb temperature tdry_set.
The more the dry-bulb temperature Tdry is lower than the set dry-bulb temperature tdry_set, the greater Kc (k) is.
S3: and acquiring the gear of the circulating fan corresponding to the drying chamber.
If a plurality of indoor units are started to operate, the gear of the circulating fan corresponding to each indoor unit needs to be acquired.
The gear of the circulating fan can be N (N is more than or equal to 2).
For example, the gears of the circulating fan are high-grade and low-grade.
The gear of each circulating fan is acquired, and the purpose is to acquire a wind gear correction coefficient Kfan (k) of each circulating fan.
If both the indoor units A1 and A2 are turned on, the air-shift correction coefficient of the circulating fan corresponding to the indoor unit A1 is Kfan (1), and the air-shift correction coefficient of the circulating fan corresponding to the indoor unit A2 is Kfan (2).
The wind shield correction coefficient Kfan (k) of each circulating fan is a coefficient which is adjusted in the experiment when the object to be dried in the drying chamber is dried.
A data table between the gear of the circulation fan and the gear correction coefficient Kfan (k) may be established in advance.
After the gear of the circulating fan is actually obtained, the corresponding wind gear correction coefficient Kfan (k) can be obtained by inquiring the data table.
S4: the outdoor ambient temperature Ttep is obtained.
The outdoor environment temperature T is acquired, and the purpose is to acquire an outdoor temperature correction coefficient KT.
It should be noted that the outdoor temperature correction coefficient KT is also a coefficient adjusted in the experiment when the object to be dried in the drying chamber is dried.
A data table between the outdoor ambient temperature T and the outdoor temperature correction coefficient KT may be established in advance.
After the outdoor environment temperature T is actually obtained, the corresponding outdoor temperature correction coefficient KT can be obtained by querying the data table.
The lower the outdoor ambient temperature T, the greater the outdoor temperature correction coefficient KT.
S5: the discharge pressure of the heat pump compressor is obtained.
The discharge pressure Pd of the heat pump compressor is acquired in order to acquire the discharge pressure correction coefficient Kpd.
It should be noted that the exhaust pressure correction coefficient Kpd is also a coefficient adjusted in the experiment when the object to be dried in the drying chamber is dried.
The exhaust pressure Pd may be established in advance in order to obtain the exhaust pressure correction coefficient Kpd.
The data table between the exhaust pressure Pd and the exhaust pressure correction coefficient Kpd.
After the exhaust pressure Pd is actually obtained, the corresponding exhaust pressure correction coefficient Kpd can be obtained by referring to the data table.
The larger the exhaust pressure Pd, the smaller the exhaust pressure correction coefficient Kpd.
S1 to S5 as described above do not have a sequential relationship, which is merely an example.
S6: the output frequency F of the heat pump compressor is obtained.
Based on the number m of each startup indoor unit, the number Khp (k) of each startup indoor unit, the dry bulb temperature correction coefficient Kc (k) of the drying chamber corresponding to each startup indoor unit, the wind gear correction coefficient Kfan (k) of the circulating fan corresponding to each startup indoor unit, the outdoor temperature correction coefficient KT and the exhaust pressure correction coefficient Kpd obtained in S1 to S5, the output frequency F of the heat pump compressor is obtained according to a preset calculation rule.
The output frequency F is used as the operating frequency of the heat pump compressor that is just started up.
In the present application, the preset calculation rule is selected as the following calculation formula:
Figure SMS_2
。
if the indoor unit A1 and the indoor unit A2 are started up, the output frequency F is calculated as follows:
F=KT*Kpd*[Khp(1)* Kfan(1)* Kc(1)+ Khp(2)* Kfan(2)* Kc(2)]。
if the indoor unit A1, the indoor unit A2, and the indoor unit A3 are started up, the output frequency F is calculated as follows:
F=KT*Kpd*[Khp(1)* Kfan(1)* Kc(1)+ Khp(2)* Kfan(2)* Kc(2)+ Khp(3)* Kfan(3)* Kc(3)]。
s7: the heat pump compressor is controlled to start up and run at an output frequency F.
The output frequency F of the starting operation of the heat pump compressor is related to the indoor units, the circulating fan, the outdoor environment temperature and the exhaust pressure of the compressor in each starting operation, factors affecting each drying chamber are comprehensively considered, the output of the heat pump compressor is enabled to be matched with the drying characteristics of the objects to be dried comprehensively, and further the drying quality of each drying chamber is guaranteed.
When the multi-connected heat pump dryer unit is started and enters into operation, if load fluctuation occurs, for example, certain indoor units are stopped or the indoor units are newly added, the output frequency F of the heat pump compressor can be influenced, and the output frequency of the heat pump compressor should be timely adjusted at the moment so as to ensure that the output frequency of the heat pump compressor meets the dynamic requirements of a plurality of drying chambers.
Judging whether the indoor unit is stopped or started by temperature control according to the temperature difference of the dry ball in the drying chamber.
When the dry bulb temperature difference delta Tdry in the drying chamber reaches below a first preset temperature threshold, the indoor unit is started up in a temperature control mode, and when the dry bulb temperature difference delta Tdry reaches above a second preset temperature threshold, the indoor unit is stopped in a temperature control mode.
Wherein the first preset temperature threshold is less than the second preset temperature threshold.
The first preset temperature threshold may be set to-1 deg.c and the second preset temperature threshold may be set to 1 deg.c.
Referring to fig. 5, during the operation of the multi-connected heat pump dryer unit, the dry bulb temperature Tdry in each drying chamber is detected in real time.
The dry-bulb temperature Tdry and the set dry-bulb temperature tdry_set are acquired, and the dry-bulb temperature difference Δtdry is calculated.
When the temperature difference delta Tdry is > -1 ℃, the indoor unit corresponding to the drying chamber is stopped in a temperature control way.
When the temperature difference delta Tdry of the dry ball is less than or equal to minus 1 ℃, the indoor unit corresponding to the drying chamber is started up by temperature control, and the temperature control is stopped until delta Tdry is more than or equal to 1 ℃.
Thus, the temperature accuracy of the dry bulb is controlled to be +/-1 ℃.
As described above, when some indoor units are stopped or newly started, the output frequency of the heat pump compressor needs to be adjusted in time.
Therefore, it is necessary to adjust the output frequency of the heat pump compressor based on the operation condition of the indoor unit.
Referring to fig. 6, a schematic diagram of adjusting the output frequency when a new indoor unit is turned on by temperature control is shown.
According to the above, when a certain indoor unit needs to be restarted, the number Khp (m+1) of indoor units to be restarted, the dry bulb temperature correction coefficient Kc (m+1) of the drying chamber of the indoor unit, the wind shield correction coefficient Kfan (m+1) of the circulating fan of the indoor unit, the outdoor temperature correction coefficient KT, and the exhaust pressure correction coefficient Kpd need to be obtained according to S1 to S5 described above.
The frequency Δf=kt Kpd Khp (m+1) Kfan (m+1) Kc (m+1) required by the indoor unit.
The update output frequency is F+ [ delta ] F.
Thus, the heat pump compressor is controlled to operate at the updated F.
If some startup indoor units are newly added, the required frequencies of the indoor units are calculated and processed, and then the output frequency F is updated.
Referring to fig. 7, a schematic diagram of adjusting the output frequency in the event of a temperature controlled shutdown of the indoor unit is shown.
According to the above, the required frequency Δf of the indoor unit needs to be calculated when the indoor unit is turned on.
Therefore, when a certain indoor unit is shut down in a temperature-controlled manner, the required frequency Δf needs to be subtracted from the current output frequency F and the output frequency needs to be updated.
The updated output frequency is F-DeltaF.
Thus, the heat pump compressor is controlled to operate at the updated F.
If some indoor units are started and stopped by temperature control, the frequencies required by the indoor units are all required to be deducted, and then the output frequency F is updated.
In normal operation, the output frequency is adjusted by the exhaust pressure difference of the heat pump compressor in this application, due to the absence of load fluctuations, for dynamic balancing between the heat pump compressor and each indoor unit.
Wherein the exhaust pressure difference is the difference between the exhaust pressure Pd and the target exhaust pressure Pdo.
It should be noted that, the normal operation herein refers to an operation condition that there is no new temperature-controlled startup indoor unit and no temperature-controlled shutdown of the startup indoor unit in a period of time (for example, 30 seconds) (i.e., each startup indoor unit normally operates).
Referring to fig. 8, a schematic diagram of adjusting the output frequency based on the exhaust pressure difference will be described.
(1) The discharge pressure of the heat pump compressor is obtained.
(2) Calculating an exhaust pressure difference: that is, the exhaust pressure difference is equal to Pd-Pdo.
(3) The cycle determines the number of adjustment steps Δf of the output frequency based on the exhaust temperature difference.
The cycle time is a period T, for example 30 seconds.
The adjustment step number Δf increases as the exhaust pressure difference increases.
The adjustment step number Δf includes a step number value and a sign including a positive sign for indicating an increasing frequency and a negative sign for indicating a decreasing frequency.
After the exhaust pressure differential reaches a first preset pressure threshold (i.e., -in the process of the down-going, the current output frequency is increased by the step number value of the adjustment step number Δf.
When the exhaust pressure difference reaches below the second preset pressure threshold (i.e., Δpd) and above the first preset pressure threshold, the current output frequency F is maintained, i.e., Δf=0.
When the exhaust pressure difference reaches above a second preset pressure threshold, the current output frequency is reduced by the step number value of the adjustment step number DeltaF.
Wherein the first preset pressure threshold is greater than the second preset pressure threshold.
The first preset pressure threshold may be selected as- Δpd ℃, the second preset pressure threshold may be selected as Δpd, and Δpd may be selected to be a value between 0.1 and 0.5.
In the present application, the adjustment step number Δf is determined by the range of the exhaust pressure difference for each cycle.
The range of the exhaust pressure difference can be divided into Pd-Pdo < -DeltaPd, -. DeltaPd is less than or equal to Pd-Pdo < -DeltaPd and DeltaPd < Pd-Pdo.
Referring to fig. 8, in case Pd-Pdo < - Δpd, the number of steps Δf=3;
when-DeltaPd is less than or equal to Pd-Pdo and less than or equal to DeltaPd, regulating the step number DeltaF=0;
when DeltaPd < Pd-Pdo, the step number DeltaF= -3 is regulated.
(4) After calculating Δf per cycle, the output frequency is updated, i.e., f=f+ [ Δf ].
After that, the next cycle is entered, and (1) is returned.
Note that Δf is a negative value, and when Δf is a positive value, it means that the current output frequency is decreased, and when Δf is a positive value, it means that the current output frequency is increased.
Therefore, when the load does not fluctuate, the exhaust pressure precision of the heat pump compressor can be controlled to be minus or plus delta Pd, and the output frequency of the compressor is ensured to meet the dynamic requirements of multiple drying chambers.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (8)

1. A multi-gang heat pump dryer unit, comprising:
a plurality of indoor units configured to communicate with the plurality of drying chambers, respectively;
a plurality of circulation fans respectively configured for a plurality of indoor units for driving an air flow passing through the indoor units to be introduced into the drying chamber by the circulation fans;
the outdoor unit is configured to be connected with each indoor unit through a refrigerant pipeline;
the processing unit is configured to acquire the output frequency of the heat pump compressor in the outdoor unit according to a preset calculation rule based on the starting number of the indoor units in each starting state, the matching number of the indoor units in each starting state, the dry bulb temperature difference correction coefficient in the corresponding drying chamber of each indoor unit in each starting state, the wind gear correction coefficient of the corresponding circulating fan in each indoor unit in each starting state, the outdoor temperature correction coefficient and the exhaust pressure correction coefficient of the heat pump compressor;
controlling the heat pump compressor to operate according to the output frequency;
wherein, the difference between the temperature of the dry bulb in the drying chamber and the set temperature of the dry bulb is the temperature difference of the dry bulb.
2. The multi-connected heat pump dryer set of claim 1, wherein the indoor unit is started up to operate based on a dry bulb temperature difference in the drying chamber, specifically:
when the temperature difference of dry balls in a drying chamber communicated with the indoor unit is lower than a first preset temperature threshold, the indoor unit is started up in a temperature control mode, and when the temperature difference of the dry balls is higher than a second preset temperature threshold, the indoor unit is stopped in a temperature control mode;
wherein the first preset temperature threshold is less than the second preset temperature threshold.
3. The multiple heat pump dryer set of claim 1, wherein the output frequency is adjusted based on an operation condition of each indoor unit during operation of the heat pump dryer set.
4. A multiple heat pump dryer unit according to claim 3, wherein in operation of the heat pump dryer unit, adjusting the output frequency based on the operation condition of each indoor unit includes:
when the indoor unit is stopped in a temperature control way, the output frequency is updated by subtracting the frequency required by the indoor unit to be stopped from the current output frequency;
when the indoor unit is started by temperature control, the output frequency is updated by adding the current output frequency to the frequency required by the indoor unit.
5. The multi-connected heat pump dryer set of claim 4, wherein the frequency Δf of indoor unit demand is obtained using the formula:
△F= KT*Kpd*Khp(k)*Kfan(k)*Kc(k)；
wherein KT is an outdoor temperature correction coefficient, kpd is an exhaust pressure correction coefficient, khp (k) is the number of indoor units, kc (k) is a dry bulb temperature difference correction coefficient corresponding to the indoor units, kfan (k) is a wind gear correction coefficient corresponding to the circulating fans of the indoor units, and k is the serial number of the indoor units.
6. The multi-connected heat pump dryer set of claim 1, wherein the preset calculation rule is the following formula:
output frequency
Figure QLYQS_1
；
Wherein k is the serial number of the indoor unit of the starting machine.
7. A multiple heat pump dryer unit according to claim 3, wherein in operation of the heat pump dryer unit, adjusting the output frequency based on the operation condition of each indoor unit includes:
when the running conditions of all indoor units are normal, the output frequency is adjusted in real time based on the exhaust pressure difference of the heat pump compressor;
wherein the exhaust pressure difference is equal to a difference between the exhaust pressure and a target exhaust pressure.
8. The multi-connected heat pump dryer set of claim 7, wherein the output frequency is adjusted in real time based on an exhaust pressure difference of the heat pump compressor, specifically:
the exhaust pressure is circularly acquired, the output frequency is increased when the exhaust pressure difference reaches below a first preset pressure threshold value, and the output frequency is reduced when the exhaust pressure difference reaches above a second preset pressure threshold value;
wherein the first preset pressure threshold is less than the second preset pressure threshold.
CN202310115010.9A 2023-02-14 2023-02-14 Multi-connected heat pump drying unit Pending CN116358285A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063127A (en) * 2010-08-18 2012-03-29 Lead Setsubi:Kk Air-conditioning hot water supply system
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CN207350718U (en) * 2015-10-26 2018-05-11 三菱电机株式会社 Air-conditioning system
CN113432354A (en) * 2021-06-22 2021-09-24 广东Tcl智能暖通设备有限公司 Air source heat pump control method and device, air source heat pump and storage medium
CN114992818A (en) * 2022-06-20 2022-09-02 珠海格力电器股份有限公司 Control method and device of air conditioner, air conditioner and storage medium
CN115435506A (en) * 2022-07-12 2022-12-06 宁波工程学院 Multi-connected dry type capillary tube radiation heat pump system and refrigerant flow control method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063127A (en) * 2010-08-18 2012-03-29 Lead Setsubi:Kk Air-conditioning hot water supply system
JP2012220122A (en) * 2011-04-11 2012-11-12 Chubu Electric Power Co Inc Waste heat sharing system
CN207350718U (en) * 2015-10-26 2018-05-11 三菱电机株式会社 Air-conditioning system
CN113432354A (en) * 2021-06-22 2021-09-24 广东Tcl智能暖通设备有限公司 Air source heat pump control method and device, air source heat pump and storage medium
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