CN111351323A - Heat pump drying device - Google Patents

Heat pump drying device Download PDF

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Publication number
CN111351323A
CN111351323A CN202010038178.0A CN202010038178A CN111351323A CN 111351323 A CN111351323 A CN 111351323A CN 202010038178 A CN202010038178 A CN 202010038178A CN 111351323 A CN111351323 A CN 111351323A
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CN
China
Prior art keywords
temperature
heat exchanger
port
bulb temperature
return air
Prior art date
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Pending
Application number
CN202010038178.0A
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Chinese (zh)
Inventor
耿延凯
王振
朱海滨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Original Assignee
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to CN202010038178.0A priority Critical patent/CN111351323A/en
Publication of CN111351323A publication Critical patent/CN111351323A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles

Abstract

The invention discloses a heat pump drying device, which comprises a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the first heat exchanger is connected with the compressor; the compressor comprises an inlet and an outlet; the first heat exchanger and the second heat exchanger are arranged in the drying room; the third heat exchanger is arranged outside the drying room; the first heat exchanger, the second heat exchanger and the third heat exchanger are connected with the inlet or the outlet through a plurality of controllable switches to form a circulating system; the working modes comprise a heating mode and a temperature stabilizing mode; in the heating mode, each controllable switch is controlled to enable the third heat exchanger to be an evaporator; one of the first heat exchanger and the second heat exchanger is an evaporator, and the other one is a condenser; and in the temperature stabilizing mode, the controllable switches are controlled to enable the first heat exchanger or the second heat exchanger to be a condenser, the second heat exchanger or the first heat exchanger to be an evaporator, or the first heat exchanger or the second heat exchanger and the third heat exchanger to be condensers, and the second heat exchanger or the first heat exchanger to be an evaporator. The temperature rise speed and the temperature control precision are improved.

Description

Heat pump drying device
Technical Field
The invention relates to the technical field of drying equipment, in particular to a heat pump drying device.
Background
Drying is an important process in the production processes of industries, agricultural and sideline products, food processing industries and the like, the drying process is a high-energy consumption process, and the control of a drying device and the drying process thereof is closely related to the quality of dried and processed products, the production efficiency, the cost, the energy consumption and the like.
The heat pump drying equipment has obvious dehumidification effect, and can rapidly dry materials at normal temperature, thereby ensuring the quality and color of the dried materials and producing high-quality products. In the prior art, a closed dehumidification heat pump system adopts the principle of condensation dehumidification, and cools wet air to below dew point temperature by using an evaporator, and heats cooled dry air by using a condenser after moisture is separated out, so that the purposes of dehumidification and drying are achieved.
However, in the earlier stage of material drying, the drying room is low in temperature and humidity, and rapid heating and dehumidification are urgently needed, and at the moment, the heat is continuously input into the system only in the form of the power of the compressor, so that heat is not absorbed from the outside, the unit is slowly heated, and the energy efficiency ratio is low.
When the medium-term temperature stabilization stage runs for a long time, energy is continuously input into the system in the form of compressor power, so that the temperature of the system is continuously increased, and the control of the drying temperature in the drying chamber is not facilitated.
When the materials are dried to the later stage, the moisture in the circulating air is smaller and smaller, the latent heat of water obtained by the evaporator from the return air is less and less, the circulating air is difficult to heat, the temperature of the circulating air is required to be heated by the electric heater to meet the temperature requirement of the drying process, and the electric energy consumption of the pure closed drying system is large.
Disclosure of Invention
The invention provides a heat pump drying device, aiming at solving the problems that in the prior art, a closed heat pump drying device is slow in initial temperature rise, large in energy consumption and difficult in accurate temperature control in the middle and later periods.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a heat pump drying device, which is used for drying articles to be dried in a drying room and comprises:
a compressor comprising an inlet, an outlet;
the first heat exchanger is arranged in the drying room;
the second heat exchanger is arranged in the drying room;
the third heat exchanger is arranged outside the drying room;
the first heat exchanger, the second heat exchanger and the third heat exchanger are connected with the inlet or the outlet through a plurality of controllable switches to form a circulating system;
the working modes comprise:
in the heating mode, each controllable switch is controlled to enable the third heat exchanger to be an evaporator; one of the first heat exchanger and the second heat exchanger is an evaporator, and the other one of the first heat exchanger and the second heat exchanger is a condenser;
and in a temperature stabilizing mode, the controllable switches are controlled to enable the first heat exchanger or the second heat exchanger to be a condenser, the second heat exchanger or the first heat exchanger to be an evaporator, or the first heat exchanger or the second heat exchanger and the third heat exchanger to be condensers, the second heat exchanger or the first heat exchanger to be an evaporator.
As a specific structural design of the heat pump drying device,
the first heat exchanger comprises a first port and a second port; the second heat exchanger comprises a third port and a fourth port; the third heat exchanger comprises a fifth port and a sixth port; the number of the controllable switches is two, and the two controllable switches are respectively a first controllable switch and a second controllable switch;
the second port, the fourth port and the sixth port are communicated with each other; the first port is connected with the outlet; the third port is connected with the inlet; the first controllable switch and the second controllable switch are respectively connected with the third heat exchanger and are respectively used for controlling the connection or disconnection of the fifth port and the outlet and the connection or disconnection of the fifth port and the inlet;
a controller connected to the compressor, the first controllable switch, and the second controllable switch, respectively; and is configured such that, in use,
when in the heating mode, the first controllable switch and the second controllable switch are controlled to act to enable the fifth port to be communicated with the inlet and disconnected from the outlet;
when the temperature stabilizing mode is adopted, the first controllable switch and the second controllable switch are controlled to act, so that the fifth port is disconnected from the inlet, disconnected from the outlet or communicated with the outlet.
Further, the air conditioner also comprises a dry bulb temperature sensor 7 which is arranged on the first heat exchanger or the second heat exchanger, is connected with the controller and detects the temperature of the return air dry bulb;
the controller receives the return air dry bulb temperature, is configured to be provided with a set dry bulb temperature and a first temperature, and judges the relationship between the return air dry bulb temperature and the set dry bulb temperature;
when the set dry bulb temperature minus the return air dry bulb temperature is greater than or equal to the first temperature, the temperature rising mode is set;
and when the set dry bulb temperature minus the return air dry bulb temperature is less than the first temperature, setting the temperature stabilizing mode.
The wet bulb temperature sensor is arranged on the first heat exchanger or the second heat exchanger, is connected with the controller and detects the temperature of return air wet bulbs;
the controller receives the return air wet bulb temperature, is configured to be provided with a set wet bulb temperature and a second temperature, and judges the relationship between the return air wet bulb temperature and the set wet bulb temperature in the temperature stabilizing mode;
if the set wet bulb temperature minus the return air wet bulb temperature is greater than or equal to the second temperature, setting a stable temperature rising mode;
and if the set wet bulb temperature minus the return air wet bulb temperature is less than the second temperature, setting the temperature to be in a stable cooling mode.
Further, the controller is configured to set a third temperature, determine a relationship between the set dry bulb temperature and the return air dry bulb temperature when in the steady warming mode;
if the return air dry bulb temperature is less than the set dry bulb temperature and is greater than or equal to the third temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor stops running;
if the return air dry bulb temperature minus the set dry bulb temperature is lower than the third temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor operates.
Further, the controller is configured to set a fourth temperature, determine a relationship between the set dry bulb temperature and the return air dry bulb temperature when in the steady cool down mode;
if the set dry bulb temperature minus the return air dry bulb temperature is greater than or equal to the fourth temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor operates;
and if the set dry bulb temperature minus the return air dry bulb temperature is lower than the fourth temperature, controlling the first controllable switch and the second controllable switch to act so that the fifth port is communicated with the outlet and disconnected from the inlet.
Preferably, the first temperature is in the range of 0-5 ℃; the second temperature is in the range of-5 to 0 ℃; the third temperature is in the range of-3 to 3 ℃; the fourth temperature is in the range of-5-2 ℃.
Further preferably, the first temperature is 2 ℃; the second temperature is-2 ℃; the third temperature is in the range of 0 ℃; the fourth temperature is in the range of-2 ℃.
Preferably, the method further comprises the following steps:
a pipe temperature sensor that is provided in the third heat exchanger, is connected to the controller, and detects a pipe temperature of the third heat exchanger;
the controller receives the piping temperature and is configured to determine the piping temperature in the warming mode;
when the piping temperature is higher than 0 ℃, controlling the first controllable switch and the second controllable switch to act so as to enable the fifth port to be communicated with the inlet and disconnected from the outlet; and when the piping temperature is less than or equal to 0 ℃, controlling the first controllable switch and the second controllable switch to operate so as to enable the fifth port to be communicated with the outlet and disconnected from the inlet.
Further, the method also comprises the following steps:
the outdoor temperature sensor is arranged outside the drying room, is connected with the controller and is used for detecting the outdoor return air temperature;
a gas supplement device connected in series between the second port and the inlet;
the opening-controllable switch is connected with the air supplementing device in series and is electrically connected with the controller;
the controller receives the outdoor return air temperature and is configured to judge the outdoor return air temperature when the temperature rising mode is adopted, the fifth port is communicated with the inlet and is disconnected with the outlet;
when the outdoor return air temperature is higher than 0 ℃, controlling the opening-controllable switch to be closed;
and when the outdoor return air temperature is less than or equal to 0 ℃, controlling the opening-controllable switch to be turned on.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the heat pump drying device, the third heat exchanger is arranged outside the drying room, and different circulating systems are formed by the third heat exchanger, the first heat exchanger and the second heat exchanger, so that different working modes are formed: a heating mode and a temperature stabilizing mode; when the initial low temperature needs to be quickly heated, a heating mode is executed, the third heat exchanger and the first heat exchanger or the second heat exchanger are both used as evaporators, and the problem that the closed heat pump drying device is low in heating efficiency only by means of the power of a compressor is solved; in addition, when the temperature rises to be close to the set temperature, a temperature stabilizing mode is executed, the third heat exchanger stops working or is a condenser, the first heat exchanger and the second heat exchanger are respectively a condenser and an evaporator, the drying room is prevented from being heated too fast and too hot, the temperature control precision in the drying room is improved, and the drying quality of the dried articles is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a circulation system of a first embodiment of a heat pump drying device according to the present invention;
FIG. 2 is a schematic view of a circulation system of a heat pump drying apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic view of a circulation system of a third embodiment of a heat pump drying apparatus according to the present invention;
fig. 4 is a schematic view of a circulation system of a fourth embodiment of the heat pump drying device of the present invention;
fig. 5 is a schematic view of a circulation system of a fifth embodiment of the heat pump drying device of the present invention;
FIG. 6 is a flow chart of an embodiment of a heat pump drying apparatus of the present invention;
fig. 7 is a flow chart of a fourth embodiment of the heat pump drying device of the present invention;
fig. 8 is a flowchart of a fifth embodiment of the heat pump drying device according to the present invention.
Reference numerals:
1. a compressor; 2. a first heat exchanger; 3. a second heat exchanger; 4. a third heat exchanger; DCF1, first solenoid valve; DCF2, second solenoid valve; 7. a dry bulb temperature sensor; 8. a wet bulb temperature sensor; 9. a tubing temperature sensor; 10. an outdoor temperature sensor; 20. a gas supplementing device; PZF2, electromagnetic expansion valve; PZF3, a controllable opening electromagnetic valve; STF1, first four-way valve; STF2, a second four-way valve; 11. an outlet; 12. an inlet; 21. a first port; 22. a second port; 31. a third port; 32. a fourth port; 41. a fifth port; 42. a sixth port; a. a first temperature; b. a second temperature; c. a third temperature; d. a fourth temperature; tsg, setting the dry bulb temperature; thg, return air dry bulb temperature; tss, setting wet bulb temperature; thg, return air wet bulb temperature; tp, piping temperature; tw, outdoor return air temperature.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The heat pump drying device comprises a compressor 1, a first heat exchanger 2, a second heat exchanger 3 and a third heat exchanger 4; the compressor 1 comprises an inlet 12, an outlet 11; the first heat exchanger 2, the second heat exchanger 3 and the third heat exchanger 4 are connected with an outlet 11 or an inlet 12 of the compressor 1 through a plurality of controllable switches, and the first heat exchanger 2, the second heat exchanger 3 and the third heat exchanger 4 are controlled to be adjacently connected with the inlet 12 or the outlet 11 through the controllable switches, so that a circulating system with an evaporator and a condenser is formed.
The heat pump drying device comprises a heating mode and a temperature stabilizing mode, wherein when the low-temperature primary heating in a drying room needs to be quickly heated, the heating mode is executed; the controllable switches are controlled to act to enable the first heat exchanger 2 or the second heat exchanger 3 to be condensers, correspondingly, the second heat exchanger 3 or the first heat exchanger 2 and the third heat exchanger 4 to be evaporators, and the third heat exchanger 4 absorbs heat outside a drying room and is used for raising the temperature in the drying room.
When the temperature in the drying room rises to be close to the required temperature and the set temperature, executing a temperature stabilizing mode, controlling the actions of all controllable switches, enabling the first heat exchanger 2 or the second heat exchanger 3 and the third heat exchanger 4 to be condensers, correspondingly enabling the second heat exchanger 3 or the first heat exchanger 2 to be evaporators, and keeping the temperature in the drying room and carrying out condensation and dehumidification;
or when the temperature in the drying room rises to be close to the required temperature, namely the set temperature, executing a temperature stabilizing mode, controlling the controllable switches to act, enabling the first heat exchanger 2 or the second heat exchanger 3 to be a condenser, correspondingly enabling the second heat exchanger 3 or the first heat exchanger 2 to be an evaporator, and enabling the third heat exchanger 4 not to be connected with a circulating system, so that the drying room is slowly heated, condensed and dehumidified.
The third heat exchanger 4 is arranged to enable the heat pump drying device to be a condenser or not to be connected with a circulating system in a temperature stabilizing mode, so that the temperature control in the drying room is easier and the precision is higher.
The system structure, the working principle and the process of the heat pump drying device according to the present invention are described in detail below with specific embodiments.
Example one
Referring to fig. 1 and 6, the heat pump drying device of the present embodiment includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a third heat exchanger 4, a controller, a dry bulb temperature sensor 7, a wet bulb temperature sensor 8, a first controllable switch, and a second controllable switch; the first controllable switch is a first solenoid valve DCF 1; the second controllable switch is a second solenoid valve DCF 2.
The compressor 1 comprises an inlet 12, an outlet 11; the first heat exchanger 2 comprises a first port 21 and a second port 22; the second heat exchanger 3 comprises a third port 31 and a fourth port 32; the third heat exchanger 4 includes a fifth port 41 and a sixth port 42.
The second port 22, the fourth port 32, and the sixth port 42 are connected to each other; the first port 21 is connected to the outlet 11; the third port 31 is connected to the inlet 12; the fifth port 41 is connected to the outlet 11 via a first solenoid valve DCF1 and to the inlet 12 via a second solenoid valve DCF 2; the first solenoid valve DCF1 and the second solenoid valve DCF2 are connected to the controller, and are controlled by the controller to be connected or disconnected.
And the dry bulb temperature sensor 7 and the wet bulb temperature sensor 8 are respectively arranged on the second heat exchanger 3, are respectively connected with the controller and are used for detecting the dry bulb temperature Thg and the wet bulb temperature Thg of the return air in the drying room.
The controller receives the return air dry bulb temperature Thg and the return air wet bulb temperature Thg, is configured to be provided with a set dry bulb temperature Tsg and a first temperature a, and judges the relationship between the return air dry bulb temperature Thg and the set dry bulb temperature Tsg.
When the dry bulb temperature Tsg minus air dry bulb temperature Thg is set to be greater than or equal to the first temperature a, the temperature rising mode is adopted, namely the controller controls the first electromagnetic valve DCF1 to be closed and the second electromagnetic valve DCF2 to be opened, the first heat exchanger 2 is a condenser, the second heat exchanger 3 and the third heat exchanger 4 are evaporators, and the third heat exchanger absorbs heat from the outside of the drying room to provide heat for the inside of the drying room, so that the temperature in the drying room is rapidly raised.
When the set dry bulb temperature Tsg minus air dry bulb temperature Thg is less than the first temperature a, the temperature stabilizing mode is adopted, namely the controller controls the first electromagnetic valve DCF1 to be closed or opened and the second electromagnetic valve DCF2 to be closed, so that the first heat exchanger 2 is a condenser, the second heat exchanger 3 is an evaporator and the third heat exchanger 4 is a condenser or is not connected with a circulating system, the temperature dehumidification or slow temperature rise dehumidification is kept in the drying room, and the dehumidification is realized while the temperature control precision is ensured.
Preferably, the controller is configured to further provide a relationship between the set wet bulb temperature Tss, the second temperature b, the third temperature c, and the fourth temperature d, and the return air wet bulb temperature Thg and the set wet bulb temperature Tss in the temperature stabilizing mode.
When the set wet bulb temperature Tss minus the wet bulb temperature Thg is greater than or equal to the second temperature b, the stable temperature rising mode is adopted; if the return air dry bulb temperature Thg minus the set dry bulb temperature Tsg is greater than or equal to the third temperature c, controlling the first electromagnetic valve DCF1 and the second electromagnetic valve DCF2 to be closed, and stopping the operation of the compressor 1; if the return air dry bulb temperature Thg is reduced by the set dry bulb temperature Tsg and is lower than the third temperature c, the first electromagnetic valve DCF1 and the second electromagnetic valve DCF2 are controlled to be closed, and the compressor 1 runs, namely, the closed heat pump drying system is obtained, so that the slow temperature rise and the condensation dehumidification are realized.
When the set wet bulb temperature Tss minus the return air wet bulb temperature Thg is lower than the second temperature b, the mode is a stable temperature keeping mode; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is greater than or equal to the fourth temperature d, the first electromagnetic valve DCF1 is controlled to be closed, the second electromagnetic valve DCF2 is controlled to be closed, and the closed heat pump drying system is operated to realize slow temperature rise and condensation dehumidification; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is lower than the fourth temperature d, the first electromagnetic valve DCF1 is controlled to be opened, the second electromagnetic valve DCF2 is controlled to be closed, namely, the third heat exchanger 4 is a condenser, and temperature keeping and dehumidification in the drying room are achieved.
Preferably, the value of the first temperature a ranges from 0 to 5 ℃; the value of the second temperature b ranges from-5 ℃ to 0 ℃; the value of the third temperature c ranges from-3 ℃ to 3 ℃; the fourth temperature d is in the range of-5 to 2 ℃.
Preferably, the first temperature a has a value of 2 ℃; the second temperature b has a value of-2 ℃; the value of the third temperature c is 0 ℃; the fourth temperature d has a value of-2 ℃.
Example two
Referring to fig. 2 and 6, the heat pump drying apparatus of the present embodiment further includes a pipe temperature sensor 9 provided in the third heat exchanger 4, connected to the controller, and configured to detect a pipe temperature Tp of the third heat exchanger 4 in addition to the first embodiment.
The controller receives the piping temperature Tp and is configured to determine the piping temperature Tp in the warming mode; when the pipe temperature Tp is equal to or lower than 0 ℃, the first solenoid valve DCF1 is controlled to be opened and the second solenoid valve DCF2 is controlled to be closed, so that the third heat exchanger 4 is a condenser, and the defrosting mode is operated.
EXAMPLE III
Referring to fig. 3 and 6, the heat pump drying apparatus of the present embodiment further includes an outdoor temperature sensor 10, an air make-up device 20, and a controllable opening solenoid valve PZF3 on the basis of the second embodiment.
The air supplementing device 20 is connected with the opening controllable solenoid valve PZF3 in series, and then two ends of the air supplementing device are respectively connected with the second port 22 and the inlet 12; the opening controllable electromagnetic valve PZF3 is connected with the controller, and the controller controls the action to make the air supply device 20 connect or not connect between the second port 22 and the inlet 12.
The outdoor temperature sensor 10 is arranged on the third heat exchanger 4, is connected with the controller and is used for detecting the outdoor return air temperature Tw; the controller receives the outdoor return air temperature Tw and is configured to judge the outdoor return air temperature Tw in the heating mode;
when the outdoor return air temperature Tw is greater than 0 ℃, the controller controls the opening controllable solenoid valve PZF3 to close, that is, the air supplement device 20 is not connected between the second port 22 and the inlet 12, and does not supplement air to the compressor 1;
when the outdoor return air temperature Tw is less than or equal to 0 ℃, the controller controls the opening-controllable solenoid valve PZF3 to be opened, and the air supplement device 20 is connected between the second port 22 and the inlet 12 to supplement air to the compressor 1, so that the efficiency of the compressor 1 is improved.
Preferably, the controller can control the opening of the controllable opening solenoid valve PZF3 according to the value of the outdoor return air temperature Tw, and control the air supply amount of the air supply device 20 to the compressor 1, so that the efficiency of the compressor 1 is better.
Example four
Referring to fig. 4, 6 and 7, the heat pump drying device of the present embodiment includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a third heat exchanger 4, a controller, a dry-bulb temperature sensor 7, and a wet-bulb temperature sensor 8; the controllable switches are a first four-way valve STF1, a first solenoid valve DCF1 and a second solenoid valve DCF2 respectively.
The compressor 1 comprises an inlet 12, an outlet 11; the first heat exchanger 2 comprises a first port 21 and a second port 22; the second heat exchanger 3 comprises a third port 31 and a fourth port 32; the third heat exchanger 4 includes a fifth port 41 and a sixth port 42.
The second port 22, the fourth port 32, and the sixth port 42 are connected to each other; the first port 21, the outlet 11, the third port 31, and the inlet 12 are connected to four ports of the first four-way valve STF1, respectively, so that the first port 21 communicates with the outlet 11 and the third port 31 communicates with the inlet 12 when the first four-way valve STF1 is closed; when the first four-way valve STF1 is open, the first port 21 communicates with the inlet 12 and the third port 31 communicates with the outlet 11; the fifth port 41 is connected to the first port 21 via a first solenoid valve DCF1 and to the third port 31 via a second solenoid valve DCF 2; the first solenoid valve DCF1 and the second solenoid valve DCF2 are connected to the controller, and are controlled by the controller to be connected or disconnected. The first four-way valve STF1 is connected to the controller and is controlled by the controller to close or open.
And the dry bulb temperature sensor 7 and the wet bulb temperature sensor 8 are respectively arranged on the second heat exchanger 3, are respectively connected with the controller and are used for detecting the dry bulb temperature Thg and the wet bulb temperature Thg of the return air in the drying room.
The controller receives the return air dry bulb temperature Thg and the return air wet bulb temperature Thg, is configured to be provided with a set dry bulb temperature Tsg and a first temperature a, and judges the relationship between the return air dry bulb temperature Thg and the set dry bulb temperature Tsg.
When the dry bulb temperature Tsg minus air dry bulb temperature Thg is set to be greater than or equal to the first temperature a, the temperature rising mode is adopted, namely the controller controls the first four-way valve STF1 to be closed, the first electromagnetic valve DCF1 to be closed and the second electromagnetic valve DCF2 to be opened, the first heat exchanger 2 is a condenser, the second heat exchanger 3 and the third heat exchanger 4 are evaporators, the third heat exchanger absorbs heat from the outside of the drying room, heating in the drying room is assisted, the temperature rising speed in the drying room is increased, and the power consumption is reduced.
When the set dry bulb temperature Tsg minus air dry bulb temperature Thg is less than the first temperature a, the temperature stabilizing mode is adopted, namely the controller controls the first four-way valve STF1 to be closed, the first electromagnetic valve DCF1 to be closed or opened, and the second electromagnetic valve DCF2 to be closed, so that the first heat exchanger 2 is a condenser, the second heat exchanger 3 is an evaporator, the third heat exchanger 4 is a condenser or is not connected with a circulating system, the temperature dehumidification or slow temperature rise dehumidification is kept in the drying room, and the dehumidification is realized while the temperature control precision is ensured.
Preferably, the controller is configured to further set a set wet bulb temperature Tss, a second temperature b, a third temperature c, and a fourth temperature d, and determine a relationship between the return air wet bulb temperature Thg and the set wet bulb temperature Tss in the temperature stabilizing mode.
When the set wet bulb temperature Tss minus the wet bulb temperature Thg is greater than or equal to the second temperature b, the stable temperature rising mode is adopted; if the return air dry bulb temperature Thg minus the set dry bulb temperature Tsg is greater than or equal to the third temperature c, controlling the first electromagnetic valve DCF1 and the second electromagnetic valve DCF2 to be closed, and stopping the operation of the compressor 1; if the return air dry bulb temperature Thg is reduced by the set dry bulb temperature Tsg and is lower than the third temperature c, the first electromagnetic valve DCF1 and the second electromagnetic valve DCF2 are controlled to be closed, and the compressor 1 runs, namely, the closed heat pump drying system is used for slowly heating and dehumidifying, so that the slow heating and condensation dehumidifying are realized.
When the set wet bulb temperature Tss minus the return air wet bulb temperature Thg is lower than the second temperature b, the mode is a stable temperature keeping mode; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is greater than or equal to the fourth temperature d, controlling the first electromagnetic valve DCF1 and the second electromagnetic valve DCF2 to be closed, operating the closed heat pump drying system, and slowly heating, condensing and dehumidifying; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is lower than the fourth temperature d, the first electromagnetic valve DCF1 is controlled to be opened, the second electromagnetic valve DCF2 is controlled to be closed, namely, the third heat exchanger 4 is a condenser, and temperature keeping and dehumidification in the drying room are achieved.
When the set wet bulb temperature Tss minus the return air wet bulb temperature Thg is lower than the second temperature b, the mode is a stable temperature keeping mode; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is less than the fourth temperature d, the third heat exchanger 4, the second heat exchanger 3 and the first heat exchanger 2 can be the condenser and the evaporator by controlling the first four-way valve STF1 to be opened, the first electromagnetic valve DCF1 to be closed and the second electromagnetic valve DCF2 to be opened, so that the temperature condensation and dehumidification in the drying room can be kept.
Preferably, the heat pump drying device of the present embodiment further includes a pipe temperature sensor 9 provided in the third heat exchanger 4, connected to the controller, and configured to detect a pipe temperature Tp of the third heat exchanger 4.
The controller receives the piping temperature Tp and is configured to determine the piping temperature Tp when in the warming mode; if the piping temperature Tp is less than or equal to 0 ℃, the first four-way valve STF1 is controlled to be opened, the first electromagnetic valve DCF1 is controlled to be closed, and the second electromagnetic valve DCF2 is controlled to be opened, so that the third heat exchanger 4 is a condenser, and the defrosting mode is operated.
Preferably, the value of the first temperature a ranges from 0 to 5 ℃; the value of the second temperature b ranges from-5 ℃ to 0 ℃; the value of the third temperature c ranges from-3 ℃ to 3 ℃; the fourth temperature d is in the range of-5 to 2 ℃.
Preferably, the first temperature a has a value of 2 ℃; the second temperature b has a value of-2 ℃; the value of the third temperature c is 0 ℃; the fourth temperature d has a value of-2 ℃.
Preferably, the heat pump drying device further comprises an outdoor temperature sensor 10, an air supply device 20 and a controllable opening solenoid valve PZF 3.
After the air supplementing device 20 is connected with the opening controllable electromagnetic valve PZF3 in series, two ends of the air supplementing device are respectively connected with the second port 22 and the inlet 12, the opening controllable electromagnetic valve PZF3 is connected with the controller, and the controller controls the action to enable the air supplementing device 20 to be connected or not connected between the second port 22 and the inlet 12.
The outdoor temperature sensor 10 is arranged on the third heat exchanger 4, is connected with the controller and is used for detecting the outdoor return air temperature Tw; the controller receives the outdoor return air temperature Tw and is configured to judge the outdoor return air temperature Tw in the heating mode;
when the outdoor return air temperature Tw is greater than 0 ℃, the controller controls the opening controllable solenoid valve PZF3 to close, that is, the air supplement device 20 is not connected between the second port 22 and the inlet 12, and does not supplement air to the compressor 1;
when the outdoor return air temperature Tw is less than or equal to 0 ℃, the controller controls the opening-controllable solenoid valve PZF3 to be opened, and the air supplement device 20 is connected between the second port 22 and the inlet 12 to supplement air to the compressor 1, so that the efficiency of the compressor 1 is improved;
preferably, the controller can control the opening of the controllable opening solenoid valve PZF3 according to the value of the outdoor return air temperature Tw, and control the air supplementing amount of the air supplementing device 20 to the compressor 1, so that the efficiency of the compressor 1 is better.
EXAMPLE five
Referring to fig. 5 and 8, the heat pump drying device of the present embodiment includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a third heat exchanger 4, a controller, a dry-bulb temperature sensor 7, and a wet-bulb temperature sensor 8; each controllable switch is a second four-way valve STF 2.
The compressor 1 comprises an inlet 12, an outlet 11; the first heat exchanger 2 comprises a first port 21 and a second port 22; the second heat exchanger 3 comprises a third port 31 and a fourth port 32; the third heat exchanger 4 includes a fifth port 41 and a sixth port 42.
The second port 22, the fourth port 32, and the sixth port 42 are connected to each other; the first port 21 is connected to the outlet 11; the third port 31 is connected to the inlet 12; the fifth port 41, the outlet 11, and the inlet 12 are connected to three ports of a second four-way valve STF2, respectively; the fourth port of the second four-way valve STF2 is closed. When the second four-way valve STF2 is closed, the fifth port 41 communicates with the inlet 12; fifth port 41 communicates with outlet 11 when second four-way valve STF2 is open.
And the dry bulb temperature sensor 7 and the wet bulb temperature sensor 8 are respectively arranged on the second heat exchanger 3, are respectively connected with the controller and are used for detecting the dry bulb temperature Thg and the wet bulb temperature Thg of the return air in the drying room.
The controller receives the return air dry bulb temperature Thg and the return air wet bulb temperature Thg, is configured to be provided with a set dry bulb temperature Tsg and a first temperature a, and judges the relationship between the return air dry bulb temperature Thg and the set dry bulb temperature Tsg.
When the set dry bulb temperature Tsg minus air dry bulb temperature Thg is greater than or equal to the first temperature a, the heating mode is established, the controller controls the second four-way valve STF2 to be closed, and then the first heat exchanger 2 is a condenser, and the second heat exchanger 3 and the third heat exchanger 4 are evaporators, so that the temperature is rapidly increased.
When the set dry bulb temperature Tsg minus air dry bulb temperature Thg is less than the first temperature a, the temperature stabilizing mode is adopted, namely the controller controls the second four-way valve STF2 to be opened, so that the first heat exchanger 2 and the third heat exchanger 4 are condensers, and the second heat exchanger 3 is an evaporator, and accurate temperature control and condensation dehumidification are realized.
Preferably, the heat pump drying device of the present embodiment further includes a pipe temperature sensor 9 provided in the third heat exchanger 4, connected to the controller, and configured to detect a pipe temperature Tp of the third heat exchanger 4.
The controller receives the piping temperature Tp and is configured to determine the piping temperature Tp when in the warming mode; if the pipe temperature Tp is less than or equal to 0 ℃, the second four-way valve STF2 is controlled to be opened, so that the third heat exchanger 4 is a condenser and a defrosting mode is realized.
Preferably, the heat pump drying apparatus of the present embodiment further includes an electromagnetic expansion valve PZF2 connected in series with the third heat exchanger 4 and connected to the controller, and the controller controls the operation of the electromagnetic expansion valve to switch the third heat exchanger 4 into the circulation system or not. The controller is configured to further set a relationship between a set wet bulb temperature Tss, a second temperature b, a third temperature c, a fourth temperature d, a return air wet bulb temperature Thg determined in the temperature stabilizing mode, and the set wet bulb temperature Tss.
When the set wet bulb temperature Tss minus the wet bulb temperature Thg is greater than or equal to the second temperature b, the stable temperature rising mode is adopted; if the return air dry bulb temperature Thg is reduced by the set dry bulb temperature Tsg and is greater than or equal to the third temperature c, the second four-way valve STF2 is controlled to be closed, the electromagnetic expansion valve PZF2 is controlled to be closed, the compressor 1 stops running, and the temperature requirement is guaranteed; if the return air dry bulb temperature Thg is reduced by the set dry bulb temperature Tsg and is lower than the third temperature c, the second four-way valve STF2, the electromagnetic expansion valve PZF2 are controlled to be closed, and the compressor 1 is controlled to run, namely, the closed heat pump drying system is obtained, so that the slow temperature rise and the condensation dehumidification are realized.
When the set wet bulb temperature Tss minus the return air wet bulb temperature Thg is lower than the second temperature b, the mode is a stable temperature keeping mode; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is greater than or equal to the fourth temperature d, controlling the second four-way valve STF2 and the electromagnetic expansion valve PZF2 to be closed, operating the closed heat pump drying system, and slowly heating, condensing and dehumidifying; if the set dry bulb temperature Tsg minus the wet bulb temperature Thg is lower than the fourth temperature d, the second four-way valve STF2 and the electromagnetic expansion valve PZF2 are controlled to be opened, that is, the third heat exchanger 4 is a condenser, so that temperature keeping and condensation dehumidification in the drying room are realized.
Preferably, the value of the first temperature a ranges from 0 to 5 ℃; the value of the second temperature b ranges from-5 ℃ to 0 ℃; the value of the third temperature c ranges from-3 ℃ to 3 ℃; the fourth temperature d is in the range of-5 to 2 ℃.
Preferably, the first temperature a has a value of 2 ℃; the second temperature b has a value of-2 ℃; the value of the third temperature c is 0 ℃; the fourth temperature d has a value of-2 ℃.
Preferably, the heat pump drying device further comprises an outdoor temperature sensor 10, an air supply device 20 and a controllable opening solenoid valve PZF 3.
After the air supplementing device 20 is connected with the opening controllable electromagnetic valve PZF3 in series, two ends of the air supplementing device are respectively connected with the second port 22 and the inlet 12, the opening controllable electromagnetic valve PZF3 is connected with the controller, and the controller controls the action to enable the air supplementing device 20 to be connected or not connected between the second port 22 and the inlet 12.
The outdoor temperature sensor 10 is arranged on the third heat exchanger 4, is connected with the controller and is used for detecting the outdoor return air temperature Tw; the controller receives the outdoor return air temperature Tw and is configured to judge the outdoor return air temperature Tw in the heating mode;
when the outdoor return air temperature Tw is greater than 0 ℃, the controller controls the opening controllable solenoid valve PZF3 to close, that is, the air supplement device 20 is not connected between the second port 22 and the inlet 12, and does not supplement air to the compressor 1;
when the outdoor return air temperature Tw is less than or equal to 0 ℃, the controller controls the opening-controllable solenoid valve PZF3 to be opened, and the air supplement device 20 is connected between the second port 22 and the inlet 12 to supplement air to the compressor 1, so that the efficiency of the compressor 1 is improved;
preferably, the controller can control the opening of the controllable opening solenoid valve PZF3 according to the value of the outdoor return air temperature Tw, and control the air supplementing amount of the air supplementing device 20 to the compressor 1, so that the efficiency of the compressor 1 is better.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a heat pump drying device for treat drying object in drying room dries, its characterized in that includes:
a compressor comprising an inlet, an outlet;
the first heat exchanger is arranged in the drying room;
the second heat exchanger is arranged in the drying room;
the third heat exchanger is arranged outside the drying room;
the first heat exchanger, the second heat exchanger and the third heat exchanger are connected with the inlet or the outlet through a plurality of controllable switches to form a circulating system;
the working modes comprise:
in the heating mode, each controllable switch is controlled to enable the third heat exchanger to be an evaporator; one of the first heat exchanger and the second heat exchanger is an evaporator, and the other one of the first heat exchanger and the second heat exchanger is a condenser;
and in a temperature stabilizing mode, the controllable switches are controlled to enable the first heat exchanger or the second heat exchanger to be a condenser, the second heat exchanger or the first heat exchanger to be an evaporator, or the first heat exchanger or the second heat exchanger and the third heat exchanger to be condensers, the second heat exchanger or the first heat exchanger to be an evaporator.
2. The heat pump drying apparatus according to claim 1,
the first heat exchanger comprises a first port and a second port; the second heat exchanger comprises a third port and a fourth port; the third heat exchanger comprises a fifth port and a sixth port; the number of the controllable switches is two, and the two controllable switches are respectively a first controllable switch and a second controllable switch;
the second port, the fourth port and the sixth port are communicated with each other; the first port is connected with the outlet; the third port is connected with the inlet; the first controllable switch and the second controllable switch are respectively connected with the third heat exchanger and are respectively used for controlling the connection or disconnection of the fifth port and the outlet and the connection or disconnection of the fifth port and the inlet;
a controller connected to the compressor, the first controllable switch, and the second controllable switch, respectively; and is configured such that, in use,
when in the heating mode, the first controllable switch and the second controllable switch are controlled to act to enable the fifth port to be communicated with the inlet and disconnected from the outlet;
when the temperature stabilizing mode is adopted, the first controllable switch and the second controllable switch are controlled to act, so that the fifth port is disconnected from the inlet, disconnected from the outlet or communicated with the outlet.
3. The heat pump drying device according to claim 2, further comprising a dry bulb temperature sensor 7, which is disposed on the first heat exchanger or the second heat exchanger, is connected to the controller, and detects a return air dry bulb temperature;
the controller receives the return air dry bulb temperature, is configured to be provided with a set dry bulb temperature and a first temperature, and judges the relationship between the return air dry bulb temperature and the set dry bulb temperature;
when the set dry bulb temperature minus the return air dry bulb temperature is greater than or equal to the first temperature, the temperature rising mode is set;
and when the set dry bulb temperature minus the return air dry bulb temperature is less than the first temperature, setting the temperature stabilizing mode.
4. The heat pump drying device according to claim 3, further comprising a wet bulb temperature sensor, disposed on the first heat exchanger or the second heat exchanger, connected to the controller, for detecting a return air wet bulb temperature;
the controller receives the return air wet bulb temperature, is configured to be provided with a set wet bulb temperature and a second temperature, and judges the relationship between the return air wet bulb temperature and the set wet bulb temperature in the temperature stabilizing mode;
if the set wet bulb temperature minus the return air wet bulb temperature is greater than or equal to the second temperature, setting a stable temperature rising mode;
and if the set wet bulb temperature minus the return air wet bulb temperature is less than the second temperature, setting the temperature to be in a stable cooling mode.
5. The heat pump drying apparatus of claim 4, wherein the controller is configured to set a third temperature, determine a relationship between the set dry bulb temperature and the return air dry bulb temperature when in the steady warm-up mode;
if the return air dry bulb temperature is less than the set dry bulb temperature and is greater than or equal to the third temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor stops running;
if the return air dry bulb temperature minus the set dry bulb temperature is lower than the third temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor operates.
6. The heat pump drying apparatus of claim 5, wherein the controller is configured to set a fourth temperature that determines a relationship between the set dry bulb temperature and the return air dry bulb temperature when in the steady cool down mode;
if the set dry bulb temperature minus the return air dry bulb temperature is greater than or equal to the fourth temperature, the first controllable switch and the second controllable switch are controlled to act so that the fifth port is disconnected from the inlet and the outlet, and the compressor operates;
and if the set dry bulb temperature minus the return air dry bulb temperature is lower than the fourth temperature, controlling the first controllable switch and the second controllable switch to act so that the fifth port is communicated with the outlet and disconnected from the inlet.
7. The heat pump drying device according to claim 6, wherein the first temperature is in a range of 0 to 5 ℃; the second temperature is in the range of-5 to 0 ℃; the third temperature is in the range of-3 to 3 ℃; the fourth temperature is in the range of-5-2 ℃.
8. The heat pump drying device according to claim 7, wherein the first temperature is 2 ℃; the second temperature is-2 ℃; the third temperature is in the range of 0 ℃; the fourth temperature is in the range of-2 ℃.
9. The heat pump drying device according to any one of claims 1 to 8, further comprising:
a pipe temperature sensor that is provided in the third heat exchanger, is connected to the controller, and detects a pipe temperature of the third heat exchanger;
the controller receives the piping temperature and is configured to determine the piping temperature in the warming mode;
when the piping temperature is higher than 0 ℃, controlling the first controllable switch and the second controllable switch to act so as to enable the fifth port to be communicated with the inlet and disconnected from the outlet; and when the piping temperature is less than or equal to 0 ℃, controlling the first controllable switch and the second controllable switch to operate so as to enable the fifth port to be communicated with the outlet and disconnected from the inlet.
10. The heat pump drying apparatus of claim 9, further comprising:
the outdoor temperature sensor is arranged outside the drying room, is connected with the controller and is used for detecting the outdoor return air temperature;
a gas supplement device connected in series between the second port and the inlet;
the opening-controllable switch is connected with the air supplementing device in series and is electrically connected with the controller;
the controller receives the outdoor return air temperature and is configured to judge the outdoor return air temperature when the temperature rising mode is adopted, the fifth port is communicated with the inlet and is disconnected with the outlet;
when the outdoor return air temperature is higher than 0 ℃, controlling the opening-controllable switch to be closed;
and when the outdoor return air temperature is less than or equal to 0 ℃, controlling the opening-controllable switch to be turned on.
CN202010038178.0A 2020-01-14 2020-01-14 Heat pump drying device Pending CN111351323A (en)

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Application Number Priority Date Filing Date Title
CN202010038178.0A CN111351323A (en) 2020-01-14 2020-01-14 Heat pump drying device

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Application Number Priority Date Filing Date Title
CN202010038178.0A CN111351323A (en) 2020-01-14 2020-01-14 Heat pump drying device

Publications (1)

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CN111351323A true CN111351323A (en) 2020-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112602958A (en) * 2020-12-15 2021-04-06 青岛海信日立空调系统有限公司 Tobacco dryer and control method of dry-wet bulb temperature sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112602958A (en) * 2020-12-15 2021-04-06 青岛海信日立空调系统有限公司 Tobacco dryer and control method of dry-wet bulb temperature sensor

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