Heat pump drying unit
阅读说明:本技术 一种热泵烘干机组 (Heat pump drying unit ) 是由 刘岁 刘兆辉 于 2019-09-03 设计创作,主要内容包括:本发明公开了一种热泵烘干机组,在导流风机的气流指引下,从烘干区进入风道腔室的高温高湿空气按路径依次流经热管换热器的下半段和第二换热器,将水分凝结出后,再依次经过热管换热器的上半段与第一换热器被加热变成高温低湿空气;该热管换热器的结构简单紧凑,且制冷剂的蒸发、上升、冷凝及下降的过程均在换热直管内实现,制冷剂的流程短、压降小,换热效率有效提高,此发明用于烘干设备领域。(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.)
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 formed by a compressor, a four-way reversing valve, a first heat exchanger, a second heat exchanger and a throttling structure, wherein the first heat exchanger and the second heat exchanger are respectively positioned in an upper air duct and a lower air duct which are communicated with each other in an air duct cavity, the lower air duct of the air duct cavity is an air inlet area, the upper air duct of the air duct 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 duct and the lower air duct is arranged in the air duct cavity, the heat pipe heat exchanger is formed by a plurality of heat exchange straight pipes, each heat exchange straight pipe is vertically arranged, the first heat exchanger and the second heat exchanger are positioned on the air outlet side of the heat pipe heat.
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: the air-cooled type air-conditioning system is characterized by further comprising a third heat exchanger arranged outside the air duct cavity and the drying area, the third heat exchanger adopts an air-cooled type 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.
7. The heat pump dryer group of claim 6, wherein: the four-way reversing valve is characterized by also comprising a second throttling structure, wherein 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.
8. The heat pump dryer group of claim 7, wherein: the compressor is connected with a pipeline of a 1 st interface of the four-way reversing valve, or a 2 nd interface of the four-way reversing valve is connected to a pipeline of the first heat exchanger, a branch pipe is connected to a pipeline of the second throttling structure and the third heat exchanger, and the branch pipe is provided with an electric valve.
9. The heat pump dryer group of claim 8, wherein: and a capillary tube is arranged on the branch pipe beside the inlet of the electric valve.
10. 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.
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
According to the heat pump drying unit, under the guidance of the airflow of the
In some embodiments, as a preferred implementation manner, in some embodiments, each heat exchange
Referring to fig. 3, in some embodiments, it is preferable that the heat exchange
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
Referring to fig. 5 to 7, the heat pump drying units according to the second, third and fourth embodiments each include a
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-
Referring to fig. 7, in the fourth embodiment of the present invention, the 2 nd port of the
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