CN110686500B - Heat pump drying unit - Google Patents
Heat pump drying unit Download PDFInfo
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- CN110686500B CN110686500B CN201910828259.8A CN201910828259A CN110686500B CN 110686500 B CN110686500 B CN 110686500B CN 201910828259 A CN201910828259 A CN 201910828259A CN 110686500 B CN110686500 B CN 110686500B
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- heat
- heat exchanger
- pipe
- air channel
- heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
The invention discloses a heat pump drying unit.A high-temperature and high-humidity air entering an air duct chamber from a drying area sequentially flows through a lower half section of a heat pipe heat exchanger and a second heat exchanger according to a path under the guidance of airflow of a guide fan, and is heated to become high-temperature and low-humidity air after moisture is condensed out and sequentially passes through an upper half section of the heat pipe heat exchanger and the first heat exchanger; the heat pipe heat exchanger has a simple and compact structure, the evaporation, rising, condensation and falling processes of the refrigerant are all realized in the heat exchange straight pipe, the flow of the refrigerant is short, the pressure drop is small, and the heat exchange efficiency is effectively improved.
Description
Technical Field
The invention relates to the field of drying equipment, in particular to a heat pump drying unit.
Background
The traditional drying operation generally adopts a drying mode taking coal as a main material and fuel oil and fuel gas as auxiliary materials, the method has the advantages of large influence on the environment, high energy consumption, low efficiency and low quality of dried products, so that a heat pump drying unit replacing the traditional operation can be produced along with the continuous progress of the technology. Most of the existing heat pump drying units are open-cycle units, the fragrance of the dried product cannot be preserved, and the appearance of the dried product is poor; for a closed circulation unit, the fragrance of the dried product can be kept and the appearance is better, but the dried product is more heated by being assisted by an electric heating device with high power, and the energy consumption and the operating cost are higher than those of an open circulation unit.
Patent CN108332518A provides a closed loop heat pump dryer, which adopts a separated heat pipe regenerator, where the evaporator and the condenser of the heat pipe regenerator are separated from each other, but the two are combined to realize the heat pipe technology; meanwhile, the refrigerant has long flowing stroke in the evaporator and the condenser of the heat pipe regenerator, and the pressure drop of the condenser side is large, so that the overall heat exchange efficiency of the heat pipe regenerator is not high.
Disclosure of Invention
The invention aims to provide a heat pump drying unit with low energy consumption and high heat exchange efficiency.
The technical scheme adopted by the invention is as follows:
a heat pump drying unit comprises a heat pump system formed by a closed loop formed by a compressor, a four-way reversing valve, a first heat exchanger, a second heat exchanger and a first throttling structure, wherein the first heat exchanger and the second heat exchanger are respectively positioned in an upper air channel and a lower air channel which are communicated with each other in an air channel cavity, the lower air channel of the air channel cavity is an air inlet area, the upper air channel of the air channel cavity is an air outlet area, the air inlet area and the air outlet area are connected with a drying area, a heat pipe heat exchanger longitudinally penetrating through the upper air channel and the lower air channel is arranged in the air channel cavity, and the heat pipe heat exchanger is formed by a plurality of heat exchange straight pipes; each heat exchange straight pipe is vertically arranged and further can be obliquely arranged, but the vertical arrangement effect is the best; the first heat exchanger and the second heat exchanger are both positioned on the air outlet side of the heat pipe heat exchanger, and a flow guide fan is arranged in the air duct cavity.
As further improvement of the technical scheme of the invention, the included angle between each heat exchange straight pipe and the vertical surface is 0 degree, namely the heat exchange straight pipes are in a vertical state.
As a further improvement of the technical scheme of the invention, a gas collecting pipe is respectively arranged above and below the heat exchange straight pipes, and two ports of each heat exchange straight pipe are respectively connected with the two gas collecting pipes.
Further as an improvement of the technical scheme of the invention, each heat exchange straight pipe is replaced by at least one snake-shaped bent pipe with two sealed ends, each snake-shaped bent pipe is divided into a straight pipe section and a bent pipe section, and each straight pipe section is in a vertical state.
As a further improvement of the technical scheme of the invention, each heat exchange straight pipe is replaced by a plurality of U-shaped pipes, a gas collecting pipe is arranged above each U-shaped pipe, the opening of each U-shaped pipe faces upwards, and the interfaces at the two ends of each U-shaped pipe are respectively connected to the gas collecting pipe.
As a further improvement of the technical scheme of the invention, the heat pipe heat exchanger comprises a plurality of vertical pipes with openings at two ends, a gas collecting pipe is respectively arranged above and below each vertical pipe, and two ports of each vertical pipe are respectively connected with two gas collecting pipes.
As a further improvement of the technical scheme of the invention, an exhaust port and an air suction port of the compressor are respectively communicated with a 1 st interface and a 2 nd interface of the four-way reversing valve, a 3 rd interface and a 4 th interface of the four-way reversing valve are respectively connected with a 1 st interface of the first heat exchanger and a 1 st interface of the second heat exchanger, and a 2 nd interface of the first heat exchanger and a 2 nd interface of the second heat exchanger are respectively connected to an inlet and an outlet of the first throttling structure.
Further as an improvement of the technical scheme of the invention, the drying device further comprises a third heat exchanger arranged outside the air duct cavity, and the third heat exchanger is positioned outside the drying area.
Further as an improvement of the technical scheme of the invention, the third heat exchanger adopts an air-cooled heat exchanger, a second fan is arranged beside the third heat exchanger, and a blowing port of the second fan points to the third heat exchanger.
As an improvement of the technical scheme of the invention, the heat exchanger is further provided with a second throttling structure, an inlet and an outlet of the second throttling structure are respectively connected to a 2 nd interface of the first heat exchanger and a 1 st interface of the third heat exchanger, and the 2 nd interface of the third heat exchanger is directly connected with a 4 th interface of the four-way reversing valve.
As a further improvement of the technical scheme of the invention, a pipeline connecting the compressor and the 1 st interface of the four-way reversing valve, or a pipeline connecting the 2 nd interface of the four-way reversing valve to the first heat exchanger is connected with a branch pipe to a pipeline connecting the second throttling structure and the third heat exchanger, and the branch pipe is provided with a first valve.
As a further improvement of the technical scheme of the invention, a capillary tube is arranged on the branch pipe beside the inlet of the first valve.
Further as an improvement of the technical scheme of the invention, the inner diameter of each heat exchange straight pipe, each serpentine bent pipe and each U-shaped pipe is larger than 10mm, a refrigerant is filled in each heat exchange straight pipe, each serpentine bent pipe and each U-shaped pipe, and the refrigerant can be R134a, R410A, R1234yf, R1234ze or carbon dioxide.
The invention has the beneficial effects that: according to the heat pump drying unit, under the guidance of the airflow of the diversion fan, high-temperature and high-humidity air entering the air duct chamber from the drying area sequentially flows through the lower half section of the heat pipe heat exchanger and the second heat exchanger according to a path, and after moisture is condensed out, the high-temperature and high-humidity air is heated to become high-temperature and low-humidity air sequentially through the upper half section of the heat pipe heat exchanger and the first heat exchanger; the heat pipe heat exchanger is simple and compact in structure, the evaporation, rising, condensation and falling processes of the refrigerant are all realized in the heat exchange straight pipe, the flow of the refrigerant is short, the pressure drop is small, and the heat exchange efficiency is effectively improved.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a unit structure according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a heat pipe heat exchanger according to an embodiment of the present invention;
FIG. 3 is a block diagram of another heat pipe heat exchanger according to an embodiment of the present invention;
FIG. 4 is a block diagram of yet another heat pipe heat exchanger according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a unit structure according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram of a unit structure according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of a unit structure according to a fourth embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, 5 to 7, embodiments of the present invention are heat pump dryer groups, including a heat pump system formed by a closed loop composed of a compressor 21, a four-way reversing valve 22, a first heat exchanger 23, a second heat exchanger 24, and a first throttling structure 25, where the first heat exchanger 23 and the second heat exchanger 24 are respectively located in an upper air duct and a lower air duct communicated with each other in an air duct chamber 1, the lower air duct of the air duct chamber 1 is an air inlet region, the upper air duct of the air duct chamber 1 is an air outlet region, the air inlet region and the air outlet region are connected to a drying region, and a heat pipe heat exchanger 3 longitudinally penetrating through the upper air duct and the lower air duct is arranged in the air duct chamber 1; as shown in fig. 2, the heat pipe heat exchanger 3 is composed of a plurality of heat exchange straight pipes 31, and an included angle between each heat exchange straight pipe 31 and a horizontal plane is 90 degrees, i.e. the heat exchange straight pipes are in a vertical state; the first heat exchanger 23 and the second heat exchanger 24 are both positioned on the air outlet side of the heat pipe heat exchanger 3, and a flow guide fan 4 is arranged in the lower air duct. Further, the first heat exchanger 23 and the second heat exchanger 24 are both air-cooled heat exchangers. In some embodiments, each heat exchange straight pipe 31 may be obliquely disposed, and the inclination angle with the vertical direction is an acute angle, but the heat exchange effect is the best with the vertical disposition in this embodiment.
According to the heat pump drying unit, under the guidance of the airflow of the guide fan 4, high-temperature and high-humidity air entering the air duct chamber 1 from the drying area sequentially flows through the lower half section of the heat pipe exchanger 3 and the second heat exchanger 24 according to a path, after moisture is condensed out, the high-temperature and high-humidity air sequentially passes through the upper half section of the heat pipe exchanger 3 and the first heat exchanger 23 and is heated to become high-temperature and low-humidity air; the heat pipe heat exchanger 3 has a simple and compact structure, the evaporation, rising, condensation and falling processes of the refrigerant are all realized in the heat exchange straight pipe 31, the flow of the refrigerant is short, the pressure drop is small, and the heat exchange efficiency is effectively improved.
In some embodiments, as a preferred implementation manner, in some embodiments, each heat exchange straight pipe 31 of the heat pipe heat exchanger 3 is replaced by at least one serpentine elbow with two sealed ends, each serpentine elbow is divided into a straight pipe section and a bent pipe section, and each straight pipe section is in a vertical state.
Referring to fig. 3, in some embodiments, it is preferable that the heat exchange straight pipes 31 of the heat pipe heat exchanger 3 are replaced by a plurality of U-shaped pipes 32, a gas collecting pipe 33 is disposed above the U-shaped pipes 32, an opening of each U-shaped pipe 32 faces upward, and interfaces at two ends of each U-shaped pipe 32 are respectively connected to the gas collecting pipe 33; the gas collecting pipe 33 collects the refrigerant gas floating up from the bottom end of each U-shaped pipe 32, the refrigerant gas is converted into refrigerant liquid after heat release and condensation in the gas collecting pipe 33, the refrigerant liquid can fall into any U-shaped pipe 32, and the flow range of the refrigerant is not limited. Further, as shown in fig. 4, in some embodiments, a gas collecting pipe 33 is respectively disposed above and below the heat exchanging straight pipes 31 of the heat pipe heat exchanger 3, and two ports of each heat exchanging straight pipe 31 are respectively connected to two gas collecting pipes 33.
The heat pipe heat exchanger in each form in the above embodiments integrates the evaporator of the heat pipe, the gas floating pipeline of the heat pipe, the condenser of the heat pipe, and the liquid down pipe of the heat pipe, wherein the upper end and the lower end of the heat pipe heat exchanger and the condenser of the heat pipe heat exchanger and the evaporator of the heat pipe heat exchanger are respectively formed, the whole structure is simple and compact, the processing difficulty is low, the risk of leakage is small, and meanwhile, the heat exchange efficiency is further improved because the flow of the refrigerant flowing in the heat pipe heat exchanger is short and the pressure drop is small.
More specifically, the inner diameters of the heat exchange straight pipes 31, the serpentine bent pipes and the U-shaped pipes 32 are all larger than 10mm, and meanwhile, the heat exchange straight pipes 31, the serpentine bent pipes and the U-shaped pipes 32 are filled with refrigerants, and the refrigerants can be selected from R134A, R410a, R1234zf or carbon dioxide according to actual needs.
Referring to fig. 5 to 7, the heat pump drying units according to the second, third and fourth embodiments each include a third heat exchanger 5 disposed outside the air duct chamber 1 and the drying area. Further, the third heat exchanger 5 in each embodiment adopts an air-cooled heat exchanger, and a second fan 6 is arranged beside the third heat exchanger 5, and a blowing port of the second fan 6 is directed to the third heat exchanger 5. In the heat pump systems of the second and third embodiments, a second throttling structure 26 is further provided, an inlet and an outlet of the second throttling structure 26 are respectively connected to the 2 nd port of the first heat exchanger and the 1 st port of the third heat exchanger 5, and the 2 nd port of the third heat exchanger 5 is directly connected to the 4 th port of the four-way reversing valve 22. After the third heat exchanger 5 is additionally arranged in the unit of each embodiment, the drying area can absorb heat from the outside, so that the heat supplement or release of the drying area is guaranteed, and the temperature rise speed is accelerated. Particularly, when the unit starts to work or needs to supplement heat in the midway, the function of changing the target temperature in the drying area can be realized, and the change of the temperature working condition can be realized according to the different dried articles; the principle is as follows: the third heat exchanger 5 is used as an evaporator, and a closed loop is formed by combining the original condenser, the compressor 21 and the four-way reversing valve 22 in the system, so that the compression refrigeration cycle can be realized, the heat of the external space is transmitted and supplemented to the drying area, and the target temperature in the drying area is changed.
As shown in fig. 6, in the heat pump drying unit according to the third embodiment of the present invention, a branch pipe is connected to a pipeline connecting the 1 st port of the four-way reversing valve 22 and the compressor 21 to a pipeline connecting the second throttling structure 26 and the third heat exchanger 5, and the branch pipe is provided with the first valve 27, and further, the first valve 27 is an electrically operated valve. Alternatively, one end of the branch pipe is connected to a pipeline of the 2 nd port of the four-way reversing valve 22 connected with the first heat exchanger 23, and the other end of the branch pipe is connected to a pipeline of the second throttling structure 26 connected with the third heat exchanger 5. Further preferably, in some embodiments, a capillary tube is installed on the branch pipe beside the inlet of the first valve 27. The arrangement of the branch pipes increases the flow path of the refrigerant in the system, and the diversified adjustment operation can be performed on the heat pump system by performing on-off adjustment or opening and closing degree adjustment on the first valve 27 on the branch pipe so as to adapt to various different drying requirements.
Referring to fig. 7, in the fourth embodiment of the present invention, the 2 nd port of the third heat exchanger 5 is connected to the fourth port of the four-way reversing valve 22, the 1 st port thereof is connected to the communicating pipe connecting the second heat exchanger 24 and the four-way reversing valve 22, and the second valve 28 is installed on the communicating pipe. Preferably, the second valve 28 is an electric valve, so that the second valve can be remotely controlled and can be opened and closed in time without manual regulation, labor force is better liberated, and the regulation efficiency of the heat pump drying unit is improved.
The second, third and fourth embodiments show different connection methods of the third heat exchanger 5 and the heat pump system main body part, so that the overall operation of the heat pump drying unit is more stable and reliable by considering various conditions, and the problems of unit operation oil return and the like are effectively solved.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (7)
1. The utility model provides a heat pump drying unit which characterized in that: the heat pump system comprises a heat pump system formed by a closed loop consisting of a compressor, a four-way reversing valve, a first heat exchanger, a second heat exchanger and a first throttling structure, wherein the first heat exchanger and the second heat exchanger are respectively positioned in an upper air channel and a lower air channel which are communicated with each other in an air channel cavity, the lower air channel of the air channel cavity is an air inlet area, the upper air channel of the air channel cavity is an air outlet area, the air inlet area and the air outlet area are connected with a drying area, a heat pipe heat exchanger longitudinally penetrating through the upper air channel and the lower air channel is arranged in the air channel cavity, the heat pipe heat exchanger consists of a plurality of heat exchange straight pipes, each heat exchange straight pipe is vertically arranged, the heat pipe heat exchanger integrates an evaporator of a heat pipe, a gas floating pipeline of the heat pipe, a condenser of the heat pipe and a liquid descending pipeline of the heat, the lower end of the heat pipe heat exchanger forms an evaporator, the first heat exchanger and the second heat exchanger are both positioned on the air outlet side of the heat pipe heat exchanger, and a flow guide fan is arranged in the air duct cavity;
the heat pump drying unit also comprises a third heat exchanger arranged outside the air duct cavity and the drying area, the third heat exchanger adopts an air-cooled heat exchanger, a second fan is arranged beside the third heat exchanger, and a blowing port of the second fan points to the third heat exchanger;
the heat pump drying unit further comprises a second throttling structure, an inlet and an outlet of the second throttling structure are respectively connected to a 2 nd interface of the first heat exchanger and a 1 st interface of the third heat exchanger, a 2 nd interface of the third heat exchanger is directly connected with a 4 th interface of the four-way reversing valve, a pipeline of the 1 st interface of the compressor and the four-way reversing valve or a pipeline of the 2 nd interface of the four-way reversing valve, which is connected to the first heat exchanger, is connected with a branch pipe to a pipeline of the second throttling structure connected with the third heat exchanger, and the branch pipe is provided with an electric valve.
2. The heat pump dryer group of claim 1, wherein: and two end ports of each heat exchange straight pipe are respectively connected with the two gas collecting pipes to form a closed structure.
3. The heat pump dryer group of claim 1, wherein: each heat exchange straight pipe is replaced by at least one snake-shaped bent pipe with two sealed ends, each snake-shaped bent pipe is divided into a straight pipe section and a bent pipe section, and each straight pipe section is in a vertical state.
4. The heat pump dryer group of claim 1, wherein: each heat exchange straight pipe is replaced by a plurality of U-shaped pipes, a gas collecting pipe is arranged above each U-shaped pipe, the opening of each U-shaped pipe faces upwards, and the interfaces at the two ends of each U-shaped pipe are respectively connected to the gas collecting pipe to form a closed structure.
5. The heat pump dryer group of claim 1, wherein: the heat pipe heat exchanger comprises a plurality of metal foils, and each metal foil is vertically arranged on the outer wall of each heat exchange straight pipe.
6. The heat pump dryer group of claim 1, wherein: and a capillary tube is arranged on the branch pipe beside the inlet of the electric valve.
7. The heat pump dryer group of claim 1, wherein: refrigerant is filled in each heat exchange straight pipe, and the refrigerant is R134a, R410A, R1234yf, R1234ze or carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828259.8A CN110686500B (en) | 2019-09-03 | 2019-09-03 | Heat pump drying unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828259.8A CN110686500B (en) | 2019-09-03 | 2019-09-03 | Heat pump drying unit |
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| Publication Number | Publication Date |
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| CN110686500A CN110686500A (en) | 2020-01-14 |
| CN110686500B true CN110686500B (en) | 2021-07-06 |
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| CN201910828259.8A Active CN110686500B (en) | 2019-09-03 | 2019-09-03 | Heat pump drying unit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310308B (en) * | 2020-02-27 | 2022-11-29 | 刘岁 | Heat pump drying unit |
| CN112327975B (en) * | 2020-11-03 | 2022-06-17 | 张勇 | Control method of efficient multistage drying system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662083A (en) * | 1985-07-15 | 1987-05-05 | Carter John L | Ventilating system for dryers |
| WO1993021489A1 (en) * | 1992-04-10 | 1993-10-28 | Khanh Dinh | Closed-loop drying process and system |
| US6094835A (en) * | 1998-12-14 | 2000-08-01 | University Of Central Florida | Heat pump dryer with desciccant enhanced moisture removal |
| US6321460B1 (en) * | 1999-12-23 | 2001-11-27 | Keum Su Jin | Drying apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039641Y (en) * | 2007-04-13 | 2008-03-19 | 南京师范大学 | Air conditioner for machine room |
| CN102809314A (en) * | 2012-08-31 | 2012-12-05 | 苏州浩佳节能科技有限公司 | Three-dimensional heat-pipe heat exchanger and production method thereof |
| CN107166902B (en) * | 2017-06-30 | 2023-04-07 | 安徽美乐柯制冷空调设备有限公司 | Multifunctional heat pump drying device |
| CN108955219B (en) * | 2018-08-01 | 2023-04-18 | 珠海格力电器股份有限公司 | Heat pump drying system |
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2019
- 2019-09-03 CN CN201910828259.8A patent/CN110686500B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662083A (en) * | 1985-07-15 | 1987-05-05 | Carter John L | Ventilating system for dryers |
| WO1993021489A1 (en) * | 1992-04-10 | 1993-10-28 | Khanh Dinh | Closed-loop drying process and system |
| US6094835A (en) * | 1998-12-14 | 2000-08-01 | University Of Central Florida | Heat pump dryer with desciccant enhanced moisture removal |
| US6321460B1 (en) * | 1999-12-23 | 2001-11-27 | Keum Su Jin | Drying apparatus |
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