CN217686493U

CN217686493U - Air source heat pump drying unit

Info

Publication number: CN217686493U
Application number: CN202221279779.1U
Authority: CN
Inventors: 栾庆坤; 佘凯; 苏勇
Original assignee: Shandong Longertek Technology Co Ltd
Current assignee: Shandong Longertek Technology Co Ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-10-28
Anticipated expiration: 2032-05-25

Abstract

The utility model relates to an air source heat pump drying unit, which comprises a shell and a heat pump system, wherein the shell is at least divided into a first cavity, a second cavity and a third cavity by a clapboard; the condenser is arranged in the first cavity, the first cavity is communicated with an air return inlet and a hot air supply outlet, and the air return inlet and the hot air supply outlet are respectively arranged on the air inlet side and the air outlet side of the condenser; the evaporator is arranged in the second cavity, the second cavity is communicated with an air inlet communicated with the outside, and the air inlet is arranged on the air inlet side of the evaporator; a fan is arranged in a third cavity, the second cavity is positioned on the air inlet side of the fan, the third cavity is communicated with an air outlet communicated with the outside, the third cavity is communicated with the first cavity through a first air door, and the first air door is arranged on the air inlet side of the condenser; the first cavity is communicated with the second cavity through a second air door, and the second air door is arranged on the air inlet side of the evaporator; the switching between the closed circulation air flow path and the open circulation air flow path is realized by controlling the opening and the closing of the first air door and the second air door. The utility model discloses simple structure is compact, and is with low costs, complete machine light in weight.

Description

Air source heat pump drying unit

Technical Field

The utility model belongs to the technical field of the heat pump is dried, in particular to air source heat pump drying unit.

Background

The drying technology generally refers to a technology of adding heat to wet materials and discharging volatile moisture to obtain solid products with certain moisture content, and the technology is widely applied to almost all production industries of agriculture, food, chemical industry, medicine, mineral products, textile and the like. The air source heat pump drying technology has the obvious advantages of energy conservation, high product quality, good drying condition and the like, and is a mainstream technology applied in the drying field in the current market.

In the prior art, the following two types of common air source heat pump drying units are mainly used: one is an open-circuit heat pump drying technology, which uses an open air source heat pump drying unit to heat the air in the external environment as dry hot air for heating and dehumidifying, and then discharges the humid hot air carrying a large amount of water vapor out of the system; the other is a closed-circuit heat pump drying technology, the object to be dried is hermetically placed in a heat-insulating and windproof system, and the wet hot air and the heat pump working medium exchange heat through closed hot air circulation to remove certain moisture, so that the purposes of dehumidification and drying are achieved.

Both of these techniques have great limitations at present, and cannot be well applied to various working conditions. Therefore, an air source heat pump drying unit integrating an open type humidity rising circulation system and a closed type dehumidification circulation system is also arranged in the prior art, but the drying unit needs to be simultaneously provided with a temperature rising evaporator and a dehumidification evaporator to realize the open type humidity rising circulation and the closed type dehumidification circulation, the pipeline of a refrigeration system is complex, the structure of the whole machine is also complex, the cost is increased, and the weight of the whole machine is larger.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a simple structure is compact, and is with low costs, complete machine light in weight's air source heat pump drying unit.

In order to achieve the above purpose, the technical scheme of the utility model is that:

an air source heat pump drying unit comprises a shell and a heat pump system, wherein the heat pump system comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially connected through a refrigerant pipeline, and the shell is at least divided into a first cavity, a second cavity and a third cavity by a partition plate;

the condenser is arranged in the first cavity, the first cavity is communicated with an air return inlet and a hot air supply outlet, and the air return inlet and the hot air supply outlet are respectively arranged on the air inlet side and the air outlet side of the condenser;

the evaporator is arranged in a second cavity, the second cavity is communicated with an air inlet communicated with the outside, and the air inlet is arranged on the air inlet side of the evaporator;

a fan is arranged in the third cavity, the second cavity is positioned on the air inlet side of the fan, the third cavity is communicated with an air outlet communicated with the outside, the third cavity is communicated with the first cavity through a first air door, and the first air door is arranged on the air inlet side of the condenser;

the first cavity is communicated with the second cavity through a second air door, and the second air door is arranged on the air inlet side of the evaporator;

the switching between the closed circulation air flow path and the open circulation air flow path is realized by controlling the opening and closing of the first air door and the second air door.

Further, have the fourth chamber of baffle divided in the shell install full heat exchanger in the shell, full heat exchanger's first flow path is used for communicateing the air flow path between air intake and the air exit, full heat exchanger installs in the second intracavity, the evaporimeter sets up the air inlet side at first flow path, full heat exchanger's second flow path is used for communicating first chamber and fourth chamber, the second air door is seted up on the baffle between second chamber and the fourth chamber.

Furthermore, a subcooler is connected in series on a refrigerant pipeline between the throttling element and the condenser, and the evaporator and the subcooler are sequentially arranged in the second cavity along an air flow path.

Further, have baffle divided fourth chamber in the shell install full heat exchanger in the shell, full heat exchanger's first flow path is used for communicateing the air flow path between air intake and the air exit, full heat exchanger installs in the second intracavity, evaporimeter and subcooler set up respectively at the air inlet side and the air-out side of first flow path, full heat exchanger's second flow path is used for first chamber and fourth chamber intercommunication, the second air door is seted up on the baffle between second chamber and the fourth chamber.

Further, the chambers in the housing are arranged in an upper, middle and lower manner, the first chamber is arranged on the uppermost layer, the second chamber and the third chamber are arranged in the middle layer side by side, and the fourth chamber is arranged on the lowermost layer.

Further, an inlet end and an outlet end of a second flow passage of the total heat exchanger are respectively arranged on the partition plate between the first cavity and the second cavity and the partition plate between the second cavity and the fourth cavity.

Furthermore, the air return opening and the air inlet are arranged on the side plate on the same side of the shell.

Further, the condenser is obliquely arranged in the first cavity and divides the first cavity into an air return cavity and an air supply cavity.

Further, the fan is fixedly arranged on the partition plate between the third cavity and the second cavity.

Further, a main machine cavity separated by a partition plate is arranged in the shell, and the compressor, the throttling element and the vapor-liquid separator are arranged in the main machine cavity.

To sum up, the utility model provides an air source heat pump drying system unit compares with prior art, has following advantage:

(1) The utility model discloses heat pump system's heat exchanger configuration has been simplified, only set of evaporimeter and one set of fan have been configured, switching through each air door of control, intercommunication or each flow path of disconnection, can realize switching between open circulation mode and the closed circulation mode, utilize an evaporimeter to play the dual function of intensification evaporimeter and dehumidification evaporimeter in the current system simultaneously, compare in current system, one set of evaporimeter and fan have been saved, not only the heat pump system pipeline has been simplified, make overall structure simple compact, the complete machine volume has been reduced, the cost of unit has also been reduced simultaneously by a wide margin, the total weight of complete machine has been reduced.

(2) The utility model discloses well each cavity adopts upper, middle and lower mode to arrange, further makes the structure of complete machine compacter, also is favorable to simplifying arranging between each part and each air door simultaneously, is favorable to further reducing the cost and reduces complete machine weight.

(3) The utility model discloses a setting of full heat exchanger and subcooler has not only promoted holistic efficiency ratio by a wide margin, also is favorable to promoting the heat exchange efficiency of this unit, has improved the closed dehumidification of unit and the effect of intensification stoving.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, the illustrative embodiments and the description of the invention serve to explain the invention without unduly limiting the invention. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view of the open cycle system of the present invention;

fig. 4 is a schematic view of the closed cycle system of the present invention.

As shown in fig. 1 to 4, the housing 1, the top plate 1a, the side plate 1b, the side plate 1c, the compressor 2, the condenser 3, the throttling element 4, the evaporator 5, the vapor-liquid separator 6, the subcooler 7, the total heat exchanger 8, the first flow passage 8a, the second flow passage 8b, the first chamber 9, the return air chamber 9a, the supply air chamber 9b, the second chamber 10, the third chamber 11, the fourth chamber 12, the return air inlet 13, the hot air supply outlet 14, the hot air blower 15, the air inlet 16, the fan 17, the air outlet 18, the first damper 19, the second damper 20, the first partition plate 21, the second partition plate 22, the third partition plate 23, the fourth partition plate 24, the fifth partition plate 25, and the main body chamber 26.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments, and the following embodiments are used to illustrate the present invention, but do not limit the scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 4, the utility model provides a pair of air source heat pump drying unit, including shell 1 and heat pump system, heat pump system includes compressor 2, condenser 3, throttling element 4 and the evaporimeter 5 that connects gradually through the refrigerant pipeline, has concatenated vapour and liquid separator 6 at compressor 2's intake pipe. In this embodiment, in order to improve the energy efficiency ratio of the heat pump system and improve the warming and drying effects, it is preferable that a subcooler 7 is further connected in series to the refrigerant pipeline between the throttling element 4 and the condenser 3. The throttle element 4 is preferably an electronic expansion valve. An enthalpy heat exchanger 8 is also provided in the casing 1, and the enthalpy heat exchanger 8 has a first flow path 8a (a flow path in the horizontal direction in fig. 4) and a second flow path 8b (a flow path in the vertical direction in fig. 4), and the air in the two air flow paths exchanges heat in the enthalpy heat exchanger 8.

As shown in fig. 1 and 2, in the present embodiment, the housing 1 is partitioned into a first chamber 9, a second chamber 10, a third chamber 11, and a fourth chamber 12 by a partition.

In order to make the air flow path of the unit smoother and make the whole structure of the unit simpler and more compact, the chambers in the housing 1 are preferably arranged in an upper, middle and lower manner, the first chamber 9 is arranged at the uppermost layer, the second chamber 10 and the third chamber 11 are arranged at the middle layer side by side, and the fourth chamber 12 is arranged at the lowermost layer. The first chamber 9 and the second chamber 10 are separated by a horizontal first partition 21, the first chamber 9 and the third chamber 11 are separated by a horizontal second partition 22, and the first partition 21 and the second partition 22 may be connected into a whole. The second chamber 10 is separated from the third chamber 11 by a vertical third partition 23, and the second chamber 10, the third chamber 11 and the fourth chamber 12 below are separated by a horizontal fourth partition 24.

Wherein, the condenser 3 is arranged in the first cavity 9 at the uppermost layer, and the shell 1 of the first cavity 9 is provided with a return air inlet 13 and a hot air supply outlet 14. The air return opening 13 and the hot air supply opening 14 are respectively arranged on the air inlet side and the air outlet side of the condenser 3.

A hot air blower 15 is attached to the hot air supply port 14. In the present embodiment, it is preferable that two hot air blowing ports 14 are opened in the casing 1, and one hot air blower 15 is attached to each hot air blowing port 14. More preferably, the two hot air blowing ports 14 are opened in the ceiling plate 1a of the casing 1. The two hot air supply outlets 14 are respectively connected with an air duct (not shown in the figure) through a mounting flange, the other end of the air duct is connected with the drying room, and hot air is sent into the drying room through the air duct.

An air return opening 13 is formed in a side plate 1b on one side of the casing 1 of the first cavity 9, and air in the drying room enters the first cavity 9 of the casing 1 through the air return opening 13.

In this embodiment, in order to optimize the air flow path between the chambers and to make the structure more compact, it is more preferable that the condenser 3 is installed in the first chamber 9 in an inclined manner, and the condenser 3 divides the first chamber 9 into the return air chamber 9a and the supply air chamber 9b.

In this embodiment, the evaporator 5, the total heat exchanger 8 and the subcooler 7 are all installed in the second chamber 10, the second chamber 10 is communicated with an air inlet 16 communicated with the outside, the air inlet 16 is arranged on the air inlet side of the evaporator 5, an air inlet valve (not shown in the figure) for controlling the opening and closing of the air inlet 16 is arranged at the air inlet 16, and the air inlet valve is connected with a control device of the unit. More preferably, the air intake 16 is provided on the side plate 1b of the casing 1 on the same side as the return air inlet 13. The evaporator 5, the total heat exchanger 8, and the subcooler 7 are installed in the second chamber 10 in series along the air flow path.

The first flow passage 8a of the total heat exchanger 8 is used for communicating an air flow path between the air inlet 16 and the air outlet 18, and the evaporator 5 and the subcooler 7 are installed at both sides of the first flow passage 8a of the total heat exchanger 8.

The second flow passage 8b of the total heat exchanger 8 is used for communicating the first chamber 9 at the uppermost layer with the fourth chamber 12 at the lowermost layer, the fourth chamber 12 is communicated with the second chamber 10 through a second damper 20, and the second damper 20 is disposed at the air intake side of the evaporator 5. The second damper 20 is preferably a damper whose opening and closing are controlled by a control device of the unit, and is used to connect or disconnect the air flow path between the second chamber 10 and the fourth chamber 12. Since the first chamber 9 and the fourth chamber 12 communicate with each other through the second flow passage 8b of the total heat exchanger 8, the second damper 20 is opened and closed by the control means, and thus, the air flow path between the first chamber 9 and the second chamber 10 can be connected or disconnected.

The inlet end of the second flow channel 8b of the total heat exchanger 8 opens into a first partition 21 between the first chamber 9 and the second chamber 10 and the outlet end of the second flow channel 8b opens into a fourth partition 24 between the second chamber 10 and the fourth chamber 12. The second damper 20 is also mounted on a fourth partition 24 on the intake side of the evaporator 5.

A fan 17 is arranged in the third cavity 11, and the second cavity 10 is positioned on the air inlet side of the fan 17, namely the evaporator 5, the total heat exchanger 8 and the subcooler 7 are all arranged on the air inlet side of the fan 17. For the sake of simplicity of construction, the fan 17 is preferably fixedly mounted directly on the third partition 23 between the third chamber 11 and the second chamber 10.

The third chamber 11 is communicated with an air outlet 18 communicated with the outside, an air outlet valve (not shown in the figure) for controlling the opening and closing of the air outlet 18 is arranged at the air outlet 18, and the air outlet valve is also connected with a control device of the unit. More preferably, the air discharge opening 18 is provided on the side plate 1c of the housing 1 on the other side opposite to the air intake opening 16. The third chamber 11 communicates with the first chamber 9 through a first damper 19, and the first damper 19 is disposed on the air intake side of the condenser 3. The first damper 19 is preferably a damper whose opening and closing are controlled by a control device for connecting and disconnecting the air flow path between the first chamber 9 and the third chamber 11. A first damper 19 is mounted on the second partition 22 between the first chamber 9 and the third chamber 11.

In this embodiment, the third chamber 11 and the second chamber 10 are disposed in the middle layer side by side, the air inlet 16 and the air outlet 18 are symmetrically disposed on the side plates on both sides of the housing 1, and the evaporator 5, the total heat exchanger 8, the subcooler 7 and the fan 17 are sequentially disposed on the air flow path between the air inlet 16 and the air outlet 18, so that the air flows more smoothly.

As shown in fig. 1 and 2, the compressor 2, the throttling element 4, and the vapor-liquid separator 6 may be independently installed, but in this embodiment, the compressor 2, the throttling element 4, and the vapor-liquid separator 6 are also integrally installed in the casing 1, a main body cavity 26 is partitioned by a fifth partition plate 25 in the casing 1, and the compressor 2, the throttling element 4, and the vapor-liquid separator 6 are installed in the main body cavity 26 in a centralized manner. More preferably, the main chamber 26 is disposed in the lowermost layer and on one side of the fourth chamber 12, the main chamber 26 and the fourth chamber 12 are disposed side by side in the lowermost layer, and the main chamber 26 avoids the total heat exchanger 8.

The heat pump drying unit realizes the automatic switching of an air flow path between a closed circulation mode and an open circulation mode by controlling the on-off of the air inlet valve, the air outlet valve, the first air door 19 and the second air door 20. The control device in the unit automatically switches the air flow path according to the detected outdoor environment temperature and humidity and the temperature and humidity of the circulating air of the drying room, so that the switching between a closed circulation mode and an open circulation mode can be realized under the condition that the compressor 2, the fan 17 and the hot air blower 15 are not stopped, and the unit and the drying process are always in a high-efficiency working state.

As shown in fig. 3 and 4, the refrigerant circuits in the closed circulation mode and the open circulation mode are the same as follows:

the refrigerant is compressed into high temperature and high pressure by the compressor 2 and releases heat to the condenser 3, the cooled refrigerant flows into the subcooler 7 to realize subcooling, the refrigerant flowing out of the subcooler 7 is throttled and depressurized by the throttling element 4 and absorbs heat in air in the evaporator 5, the refrigerant is subjected to heat absorption and evaporation in the evaporator 5, and the evaporated refrigerant gas enters the vapor-liquid separator 6 and finally returns to the compressor 2.

As shown in fig. 3, the air path in the open circulation mode circulates as follows:

in the open circulation mode, the air inlet valve at the air inlet 16 is opened, the air outlet valve at the air outlet 18 is opened, the first air door 19 is closed, and the second air door 20 is closed.

Air path 1: air in the drying room enters the first cavity 9 of the shell 1 through the return air duct and the return air inlet 13 on the shell 1, all return air A flows to the condenser 3 uniformly and exchanges heat with high-temperature refrigerants in the condenser 3, the return air A absorbs the heat of the refrigerants, the return air A is heated to form hot air B, the hot air B is sent out through the hot air blower 15, and the hot air B is sent into the drying room through the air supply duct, so that the function of conveying hot air to the room is realized.

An air path 2: outdoor air C is introduced into the second cavity 10 of the shell 1 through the air inlet 16 under the action of the fan 17, the outdoor air C firstly exchanges heat with a low-temperature refrigerant in the evaporator 5, the evaporator 5 absorbs the heat of the outdoor air C, the cooled outdoor air C exchanges heat with the refrigerant in the subcooler 7 after passing through the first flow channel 8a of the total heat exchanger 8, the cooled outdoor air C is used for cooling the refrigerant in the subcooler 72, the purpose of improving the supercooling degree of the condenser 3 is achieved, the refrigerant with a certain supercooling degree enters the throttling element 4 for throttling and cooling, the energy efficiency ratio of a unit is favorably improved, and the air flows out of the air cooler 7 through the air outlet 18 and is exhausted into the atmosphere.

In this mode, since the second damper 20 is closed, the air flow path between the first chamber 9 and the second chamber 10 is cut off, and all of the return air introduced into the first chamber 9 directly passes through the condenser 3 to be heated, and the evaporator 5 functions as a temperature raising evaporator in this mode.

As shown in fig. 4, the closed cycle mode of operation is as follows:

in the closed circulation mode, the air inlet valve at the air inlet 16 is closed, the air outlet valve at the air outlet 18 is closed, the first air door 19 is opened, and the second air door 20 is opened.

Air passage 1: air in the drying room enters the first cavity 9 of the shell 1 through the return air duct and the return air inlet 13 on the shell 1, part of return air A flows to the condenser 3 and exchanges heat with a high-temperature refrigerant in the condenser 3, the part of return air A absorbs the heat of the refrigerant, the return air A is heated to form hot air B, the hot air B is sent out through the hot air blower 15, and the hot air B is sent into the drying room through the air supply duct, so that the function of conveying hot air to the room is realized.

An air path 2: the return air A in the drying room is divided into a bypass branch D, the air in the bypass branch D enters a second flow channel 8b of the total heat exchanger 8, the air flowing out of the outlet end of the second flow channel 8b enters a fourth cavity 12, the air flows back into a second cavity 10 through a second air door 20 on a fourth partition plate 24 under the action of a fan 17 and is conveyed to the evaporator 5 to exchange heat with low-temperature refrigerants in the evaporator 5, the return air in the bypass branch D is cooled by the evaporator 5 to achieve the purpose of dehumidification, the dehumidified dry air enters a first flow channel 8a of the total heat exchanger 8 and exchanges heat with the return air entering from the second flow channel 8b in the total heat exchanger 8, the cooled air is used for precooling the return air with higher temperature, and the precooled air exchanges heat with the evaporator 5, so that the dehumidification temperature can be further reduced, and the dehumidification effect can be improved.

The air passing through the total heat exchanger 8 exchanges heat with the refrigerant in the subcooler 7, the air after heat exchange enters the first cavity 9 through the first air door 19 on the second partition plate 22 between the third cavity 11 and the first cavity 9, is mixed with the return air A, exchanges heat with the high-temperature refrigerant in the condenser 3, and is sent into the drying room by the dry hot air B under the action of the hot air blower 15.

When the dehumidified dry air passes through the total heat exchanger 8, the dehumidified dry air is preheated after being precooled for return air, and the preheated air is heated by the subcooler 7 and the condenser 3 to form hot air B capable of being supplied to the drying room, so that the heating effect of the hot air B can be further improved.

In this mode, since the second damper 20 is in the open state, the air flow path between the first chamber 9 and the second chamber 10 is communicated after passing through the total heat exchanger 8 and the fourth chamber 12, and part of the return air entering the first chamber 9 is cooled and dehumidified by passing through the evaporator 5, and the evaporator 5 functions as a dehumidification evaporator in this mode.

Example two:

the difference from the first embodiment is that the unit does not need to be provided with the total heat exchanger 8, the subcooler 7 and the evaporator 5 are arranged in the second chamber 10 side by side, a second air door 20 for communicating the first chamber 9 and the second chamber 10 is arranged on a first partition 21 between the first chamber 9 and the second chamber 10, and the second air door 20 is still arranged on the air inlet side of the evaporator 5. The other structures are the same as those described in the first embodiment.

In this configuration, the fourth chamber 12 may be a main body chamber, and the compressor 2, the throttle element 4, the vapor-liquid separator 6, and the like may be installed in the fourth chamber 12 at the lowermost layer. No damper structure is provided between the fourth chamber 12 and the second chamber 10.

Of course, the fourth chamber 12 may not be provided in the unit, and only the first chamber 9, the second chamber 10 and the third chamber 11 are provided, the first chamber 9 is provided at the upper layer, and the second chamber 10 and the third chamber 11 are provided at the lower layer side by side. In this structure, the main body chamber 26 may be disposed at one side of the first chamber 9, or at one side of the second chamber 10 or the third chamber 11, and the positions of the intake port 16 and the exhaust port 18 may be adaptively changed.

In this structure, the air path circulation in the open circulation mode is substantially the same as that described in the first embodiment, except that the outdoor air C entering the second chamber 10 through the air inlet 16 directly enters the subcooler 7 after passing through the evaporator 5, and does not pass through the total heat exchanger 8 described in the first embodiment.

The closed cycle mode of operation is as follows:

Air path 1: air in the drying room enters the first cavity 9 of the shell 1 through the return air duct and the return air inlet 13 on the shell 1, part of return air A flows to the condenser 3 and exchanges heat with a high-temperature refrigerant in the condenser 3, the part of return air A absorbs heat of the refrigerant, the return air A is heated to form hot air B, the hot air B is sent out through the hot air blower 15, and the hot air B is sent into the drying room through the air supply duct, so that the function of conveying hot air to the room is realized.

Air passage 2: the return air A in the stoving room divides into bypass branch D, the air in the bypass branch D gets into in the second chamber 10 through second air door 20 under the effect of fan 17, carry to evaporimeter 5, carry out the heat exchange with the low temperature refrigerant in the evaporimeter 5, utilize evaporimeter 5 to cool down the purpose that reaches the dehumidification to the return air in this bypass branch D, the dry air after cooling and dehumidification carries out the heat exchange with the refrigerant in the subcooler 7 again, the air after the heat transfer gets into in the first chamber 9 through first air door 19 on the second baffle 22 between third chamber 11 and the first chamber 9, mix with return air A, carry out the heat exchange with the high temperature refrigerant in the condenser 3 in the lump, under the effect of hot-blast forced draught blower 15, dry hot-blast B is sent to in the stoving room.

Example three:

the difference from the first embodiment is that a total heat exchanger 8 is installed in the casing 1, but without the intercooler 7, and the throttling element 4 is connected in series to the refrigerant pipe between the condenser 3 and the evaporator 5.

The total heat exchanger 8 and the evaporator 5 are installed in the second chamber 10 side by side along an air flow path, a first flow path 8a of the total heat exchanger 8 is used for communicating the air flow path between the air inlet 16 and the air outlet 18, the evaporator 5 is arranged on the air inlet side of the first flow path 8a, a second flow path 8b of the total heat exchanger 8 is used for communicating the uppermost first chamber 9 with the lowermost fourth chamber 12, and a second damper 20 is arranged on a fourth partition plate 24 between the second chamber 10 and the fourth chamber 12. The other structures are the same as those described in the first embodiment.

Under the structure, the refrigerant loops under the closed circulation mode and the open circulation mode are as follows:

the refrigerant is compressed into high temperature and high pressure by the compressor 2 and then releases heat to the condenser 3, the cooled refrigerant is throttled and depressurized by the throttling element 4, the refrigerant absorbs heat in air in the evaporator 5, the refrigerant is subjected to heat absorption and evaporation in the evaporator 5, the evaporated refrigerant gas enters the vapor-liquid separator 6, and finally the refrigerant gas returns to the compressor 2.

With this structure, the air path circulation in the open circulation mode is substantially the same as that described in the first embodiment, except that the air C outside the chamber entering the second chamber 10 from the air inlet 16 passes through the evaporator 5 and the total heat exchanger 8 and then is directly exhausted to the atmosphere through the air outlet 18, and does not pass through the subcooler 7 described in the first embodiment.

Under the structure, the working modes of the closed cycle are as follows:

in the closed circulation mode, the intake valve at the intake port 16 is closed, the exhaust valve at the exhaust port 18 is closed, the first damper 19 is opened, and the second damper 20 is opened.

An air path 2: the return air A in the drying room is divided into a bypass branch D, the air in the bypass branch D enters a second flow channel 8b of the total heat exchanger 8, the air flowing out from the outlet end of the second flow channel 8b enters a fourth cavity 12, the air flows back into a second cavity 10 through a second air door 20 on a fourth partition plate 24 under the action of a fan 17 and is conveyed to the evaporator 5 to exchange heat with low-temperature refrigerants in the evaporator 5, the return air in the bypass branch D is cooled by the evaporator 5 to achieve the purpose of dehumidification, the dried air after cooling and dehumidification enters a first flow channel 8a of the total heat exchanger 8 and exchanges heat with the return air entering from the second flow channel 8b in the total heat exchanger 8, the return air is pre-cooled by the cooled air, and the pre-cooled air exchanges heat with the evaporator 5, so that the dehumidification temperature is further reduced, and the dehumidification effect is improved.

The air passing through the total heat exchanger 8 enters the first cavity 9 through the first air door 19 on the second partition plate 22 between the third cavity 11 and the first cavity 9, is mixed with the return air A, and exchanges heat with the high-temperature refrigerant in the condenser 3, and the dry hot air B is sent into the drying room under the action of the hot air blower 15.

When the dry air dehumidified by the evaporator 5 passes through the total heat exchanger 8, the dehumidified dry air is preheated while precooling the return air, and the preheated air is heated by the condenser 3 to form hot air B capable of being supplied into the drying room, so that the heating effect of the hot air B can be further improved.

The utility model provides a heat pump drying unit has following advantage:

(1) This heat pump drying unit has simplified heat pump system's heat exchanger configuration, only set of evaporimeter and a set of fan have been configured, through the switching of controlling each air door, each flow path is connected or broken off, can realize the switching between open circulation mode and the closed circulation mode, utilize an evaporimeter to play the dual function of intensification evaporimeter and dehumidification evaporimeter in the current system simultaneously, compare in current system, a set of evaporimeter and fan have been saved, heat pump system pipeline has not only been simplified, make overall structure simple compact, the complete machine volume has been reduced, the cost of unit has also been reduced by a wide margin simultaneously, the total weight of complete machine has been reduced.

(2) The chambers in the heat pump drying unit are arranged in an upper mode, a middle mode and a lower mode, so that the structure of the whole machine is further more compact, the arrangement between each part and each air door is simplified, and the cost and the weight of the whole machine are further reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention will still fall within the scope of the present invention.

Claims

1. The utility model provides an air source heat pump drying unit, includes shell and heat pump system, heat pump system includes compressor, condenser, throttling element and the evaporimeter that connects gradually through the refrigerant pipeline, its characterized in that: dividing the interior of the housing into at least a first chamber, a second chamber and a third chamber by a partition;

2. The air-source heat pump drying unit of claim 1, wherein: the utility model discloses an air conditioner, including shell, air inlet, air outlet, evaporator, full heat exchanger, second runner, second air door, first chamber and fourth chamber, be equipped with baffle divided fourth chamber in the shell install full heat exchanger in the shell, full heat exchanger's first runner is used for communicateing the air flow path between air inlet and the air exit, full heat exchanger installs in the second intracavity, the evaporator sets up the air inlet side at first runner, full heat exchanger's second runner is used for communicateing first chamber and fourth chamber, the second air door is seted up on the baffle between second chamber and the fourth chamber.

3. The air-source heat pump drying unit of claim 1, wherein: and a subcooler is connected in series on a refrigerant pipeline between the throttling element and the condenser, and the evaporator and the subcooler are sequentially arranged in the second cavity along an air flow path.

4. The air source heat pump dryer group of claim 3, characterized in that: have baffle divided fourth chamber in the shell install full heat exchanger in the shell, full heat exchanger's first flow path is used for communicateing the air flow path between air intake and the air exit, full heat exchanger installs in the second intracavity, evaporimeter and subcooler set up the air inlet side and the air-out side at first flow path respectively, full heat exchanger's second flow path is used for communicateing first chamber and fourth chamber, the second air door is seted up on the baffle between second chamber and the fourth chamber.

5. The air source heat pump dryer group of claim 2 or 4, wherein: each cavity in the shell is arranged in an upper, middle and lower mode, the first cavity is arranged on the uppermost layer, the second cavity and the third cavity are arranged in the middle layer side by side, and the fourth cavity is arranged on the lowermost layer.

6. The air-source heat pump drying unit of claim 5, wherein: and the inlet end and the outlet end of the second flow passage of the total heat exchanger are respectively arranged on the partition plate between the first cavity and the second cavity and the partition plate between the second cavity and the fourth cavity.

7. The air-source heat pump drying unit of claim 5, wherein: the air return opening and the air inlet are formed in the side plate on the same side of the shell.

8. The air-source heat pump drying unit of claim 1, wherein: the condenser is obliquely arranged in the first cavity and divides the first cavity into an air return cavity and an air supply cavity.

9. The air-source heat pump drying unit of claim 1, wherein: the fan is fixedly arranged on the partition plate between the third cavity and the second cavity.

10. The air-source heat pump dryer group of claim 1, wherein: there is also a main body chamber separated by a partition within the housing, and a compressor, a throttling element and a vapor-liquid separator are mounted within the main body chamber.